Arteriovenous malformation

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kalsang Dolma, M.B.B.S.[2]

Synonyms and keywords: AVM; arterio-venous malformations; arteriovenous malformations

Overview

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kalsang Dolma, M.B.B.S.[2]

Overview

Arteriovenous malformation is a congenital disorder of the connections between veins and arteries in the vascular system. The genetic transmission patterns of AVM (if any) are unknown, and AVM is not generally thought to be an inherited disorder–unless in the context of a specific hereditary syndrome.

Historical Perspective

Emmanuel, Luschka and Virchow first described arteriovenous malformations in the mid-1800s. Olivecrona performed the first surgical excision of an intracranial AVM in 1932.

Pathophysiology

Arteries and veins are part of the human cardiovascular system. Normally, the arteries in the vascular system carry oxygen-rich blood at a relatively high pressure. Structurally, arteries divide and sub-divide repeatedly, eventually forming a sponge-like capillary bed. Blood moves through the capillaries, giving up oxygen and taking up waste products from the surrounding cells. Capillaries successively join together, one upon the other, to form the veins that carry blood away at a relatively low pressure. The heart acts to pump blood from the low pressure veins to the high pressure arteries.

Epidemiology and Demographics

An estimated 300,000 people in the US have AVMs, of which 12% (approximately 36,000) will exhibit symptoms that differ greatly in severity.

Diagnosis

Symptoms

Symptoms of AVM vary according to the location of the malformation. Roughly (88% -needs citation) AVM are asymptomatic; often the malformation is discovered as part of an autopsy or during treatment of an unrelated disorder (called in medicine an incidental finding), rarely its expansion or a micro-bleed from it, could cause epilepsy, deficit or elicit pain.

Treatment

Medical Therapy

Treatment for brain AVMs can be symptomatic, and patients should be followed by a neurologist for any seizures, headaches or focal deficits. AVM-specific treatment may also involve endovascular embolization, neurosurgery or radiation therapy. Embolization, that is, cutting off the blood supply to the AVM with coils or particles or glue introduced by a radiographically guided catheter, can be used in addition to either, but is rarely successful in isolation except for in smaller AVMs. The neurological risk of any such intervention is roughly 10%.

Surgery

The Spetzler-Martin grading system developed at the Barrow Neurological Institute is utilized by neurosurgeons to determine operative versus nonoperative management of AVMs.

Future or Investigational Therapies

Despite many years of research, the central question of whether to treat AVMs has not been answered. All treatments, whether involving surgery, radiation, or drugs, have risks and side-effects. Therefore, it might be better in some cases to avoid treatment altogether and simply accept a small risk of coming to harm from the AVM itself. This question is currently being addressed in clinical trials.^[1].

References

↑ Research trials in arterio-venous malformations; Rustam Al-Shahi Salman

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Historical Perspective

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kalsang Dolma, M.B.B.S.[2]

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Overview

Emmanuel, Luschka and Virchow first described arteriovenous malformations in the mid-1800s. Olivecrona performed the first surgical excision of an intracranial AVM in 1932.

References

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Classification

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References

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Pathophysiology

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kalsang Dolma, M.B.B.S.[2]

Please help WikiDoc by adding more content here. It’s easy! Click here to learn about editing.

Overview

Arteries and veins are part of the human cardiovascular system. Normally, the arteries in the vascular system carry oxygen-rich blood at a relatively high pressure. Structurally, arteries divide and sub-divide repeatedly, eventually forming a sponge-like capillary bed. Blood moves through the capillaries, giving up oxygen and taking up waste products from the surrounding cells. Capillaries successively join together, one upon the other, to form the veins that carry blood away at a relatively low pressure. The heart acts to pump blood from the low pressure veins to the high pressure arteries.

Pathophysiology

If the capillary bed is thought of as a sponge, then an AVM is the rough equivalent of inserting a tangle of drinking straw|flexible soda straws from artery to vein through that sponge. On an arteriogram, an AVM often resemble a tangle of spaghetti noodles. This tangle of blood vessels forms a relatively direct connection between high pressure arteries and low pressure veins and bypasses the capillary bed.

The result is a collection of blood vessels with abnormal connections and no capillaries. This collection, often called a nidus, can be extremely fragile and prone to bleeding. This bleeding can be catastrophic if it occurs in the brain, the lung or the gastrointestinal tract.

AVMs can occur in various parts of the body

Brain, causing a cerebral arteriovenous malformation
Spleen^[1]
Lung^[2]
Kidney^[3]
Spinal cord^[4]
Liver^[5]
Intercostal space^[6]
Iris^[7]
Spermatic cord^[8]

Genetics

Can occur due to autosomal dominant diseases, such as hereditary hemorrhagic telangiectasia

Microscopic Pathology

References

↑ Agrawal A, Whitehouse R, Johnson RW, Augustine T (2006). “Giant splenic artery aneurysm associated with arteriovenous malformation”. J. Vasc. Surg. 44 (6): 1345–9. doi:10.1016/j.jvs.2006.06.049. PMID 17145440. Retrieved 2008-06-01. Unknown parameter |month= ignored (help)
↑ Chowdhury UK, Kothari SS, Bishnoi AK, Gupta R, Mittal CM, Reddy S (2008). “Successful Lobectomy for Pulmonary Arteriovenous Malformation Causing Recurrent Massive Haemoptysis”. Heart Lung Circ. doi:10.1016/j.hlc.2007.11.142. PMID 18294908. Retrieved 2008-06-01. Unknown parameter |month= ignored (help)
↑ Barley FL, Kessel D, Nicholson T, Robertson I (2006). “Selective embolization of large symptomatic iatrogenic renal transplant arteriovenous fistula”. Cardiovasc Intervent Radiol. 29 (6): 1084–7. doi:10.1007/s00270-005-0265-z. PMID 16794894.
↑ Kishi K, Shirai S, Sonomura T, Sato M (2005). “Selective conformal radiotherapy for arteriovenous malformation involving the spinal cord”. Br J Radiol. 78 (927): 252–4. PMID 15730991. Unknown parameter |month= ignored (help)
↑ Bauer T, Britton P, Lomas D, Wight DG, Friend PJ, Alexander GJ (1995). “Liver transplantation for hepatic arteriovenous malformation in hereditary haemorrhagic telangiectasia”. J. Hepatol. 22 (5): 586–90. PMID 7650340. Retrieved 2008-06-01. Unknown parameter |month= ignored (help)
↑ Rivera PP, Kole MK, Pelz DM, Gulka IB, McKenzie FN, Lownie SP (2006). “Congenital intercostal arteriovenous malformation”. AJR Am J Roentgenol. 187 (5): W503–6. doi:10.2214/AJR.05.0367. PMID 17056881. Unknown parameter |month= ignored (help)
↑ Shields JA, Streicher TF, Spirkova JH, Stubna M, Shields CL (2006). “Arteriovenous malformation of the iris in 14 cases”. Arch. Ophthalmol. 124 (3): 370–5. doi:10.1001/archopht.124.3.370. PMID 16534057. Unknown parameter |month= ignored (help)
↑ Sountoulides P, Bantis A, Asouhidou I, Aggelonidou H (2007). “Arteriovenous malformation of the spermatic cord as the cause of acute scrotal pain: a case report”. J Med Case Reports. 1: 110. doi:10.1186/1752-1947-1-110. PMID 17939869.

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Causes

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References

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Differentiating Arteriovenous malformations from other Diseases

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Fahimeh Shojaei, M.D.

Overview

On the basis of seizure, visual disturbance, and constitutional symptoms, astrocytoma must be differentiated from oligodendroglioma, meningioma, hemangioblastoma, pituitary adenoma, schwannoma, primary CNS lymphoma, medulloblastoma, ependymoma, craniopharyngioma, pinealoma, AV malformation, brain aneurysm, bacterial brain abscess, tuberculosis, toxoplasmosis, hydatid cyst, CNS cryptococcosis, CNS aspergillosis, and brain metastasis.

Differentiating arteriovenous malformation from other Diseases

Differentiating arteriovenous malformationfrom other diseases on the basis of seizure, visual disturbance, and constitutional symptoms

On the basis of seizure, visual disturbance, and constitutional symptoms, arteriovenous malformationmust be differentiated from oligodendroglioma, meningioma, hemangioblastoma, pituitary adenoma, schwannoma, primary CNS lymphoma, medulloblastoma, ependymoma, craniopharyngioma, pinealoma, astrocytoma, brain aneurysm, bacterial brain abscess, tuberculosis, toxoplasmosis, hydatid cyst, CNS cryptococcosis, CNS aspergillosis, and brain metastasis.

	Symptoms				Physical examination	Lab Findings	MRI	Immunohistopathology
Diseases	Clinical manifestations					Para-clinical findings			Gold standard	Additional findings
	Symptoms				Physical examination	Para-clinical findings
	Head- ache	Seizure	Visual disturbance	Constitutional	Focal neurological deficit	Lab Findings	MRI	Immunohistopathology
Vascular
AV malformation ^[1]^[2]^[3]	+	+	+/−	−	+/−	−	Supratentorial: ~85% Flow voids on T2 weighted images	We do not perform biopsy for AVM	Angiography	We may see bag of worms appearance in CT angiography
Brain aneurysm ^[4]^[5]^[6]^[7]^[8]	+	+/−	+/−	−	+/−	−	In magnetic resonance angiography, we may see aneurysm mostly in anterior circulation (~85%)	We do not perform biopsy for brain aneurysm	MRA and CTA	It is associated with autosomal dominant polycystic kidney disease, Ehlers-Danlos syndrome, pseudoxanthoma elasticum and Bicuspid aortic valve (Angiography is reserved for patients who have negative MRA and CTA)
Childhood primary brain tumors
Pilocytic astrocytoma ^[9]^[10]^[11]	+	+/−	+/−	−	+	−	Infratentorial Solid and cystic component Mostly in posterior fossa Usually in cerebellar hemisphers and vermis	Glial cell origin Solid and cystic component GFAP +	Biopsy	Most of the time, cerebellar dysfunction is the presenting signs.
Medulloblastoma ^[12]^[13]^[14]	+	+/−	+/−	−	+	−	Infratentorial Mostly in cerebellum Non communicating hydrocephalus	Neuroectoderm origin Homer wright rosettes	Biopsy	Drop metastasis (metastasis through CSF)
Ependymoma ^[15]^[3]	+	+/−	+/−	−	+	−	Infratentorial Usually found in 4th ventricle Mixed cystic/solid lesion Hydrocephalus	Ependymal cell origin Perivascular pseudorosette	Biopsy	Causes an unusually persistent, continuous headache in children.
Craniopharyngioma ^[16]^[17]^[18]^[3]	+	+/−	+ Bitemporal hemianopia	−	+	Hypopituitarism as a result of pressure effect on pituitary gland	Calcification Lobulated contour Motor-oil like fluid within tumor	Ectodermal origin (Rathkes pouch) Calcification +	Biopsy	Initialy presents with lower bitemporal quadrantanopsia followed by bitemporal hemianopsia (pressure on optic chiasma from above)
Pinealoma ^[19]^[20]^[21]	+	+/−	+/−	−	+ vertical gaze palsy	B-hCG rise leads to precocious puberty in males	Hydrocephalus (compression of cerebral aqueduct)	Similar to testicular seminoma	Biopsy	May cause prinaud syndrome (vertical gaze palsy, pupillary light-near dissociation, lid retraction and convergence-retraction nystagmus
Adult primary brain tumors
Glioblastoma multiforme ^[22]^[23]^[3]	+	+/−	+/−	−	+	−	Supratentorial Irregular ring-nodular enhancing lesions Central necrosis Surrounding vasogenic edema Cross corpus callosum (butterfly glioma)	Astrocyte origin Pleomorphic cell Pseudopalisading appearance GFAP + Necrosis + Hemorrhage + Vascular prolifration +	Biopsy	Highest incidence in fifth and sixth decades of life Most of the time, focal neurological deficit is the presenting sign.
Oligodendroglioma ^[24]^[25]^[26]	+	+	+/−	−	+	−	Almost always in cerebral hemisphers (frontal lobes) Hypointense on T1 Hyperintense on T2 Calcification Chicken wire capillary pattern	Oligodendrocyte origin Calcification + Fried egg cell appearance	Biopsy	Highest incidence is between 40 and 50 years of age. Most of the time, epileptic seizure is the presenting sign.
Meningioma ^[27]^[28]^[29]	+	+/−	+/−	−	+	−	Well circumscribed Extra-axial mass Dural attachment CSF vascular cleft sign Sunburst appearance of the vessels	Arachnoid origin Psammoma bodies Whorled spindle cell pattern	Biopsy	Highest incidence is between 40 and 50 years of age. Most of the time, focal neurological deficit and epileptic seizure are the presenting signs. May be associated with NF-2
Hemangioblastoma ^[30]^[31]^[32]^[33]	+	+/−	+/−	−	+	−	Infratentorial Cystic lesion with a solid enhancing mural nodule	Blood vessel origin Capillaries with thin walls	Biopsy	Might secret erythropoietin and cause polycythemia May be associated with von hippel-lindau syndrome
Pituitary adenoma ^[34]^[35]^[3]	−	−	+ Bitemporal hemianopia	−	−	Endocrine abnormalities as a result of functional adenomas or pressure effect of non-functional adenomas	Isointense to normal pituitary gland in T1	Endocrine cell hyperplasia	Biopsy	It is associated with MEN1 disease. Initialy presents with upper bitemporal quadrantanopsia followed by bitemporal hemianopsia (pressure on optic chiasma from below)
Schwannoma ^[36]^[37]^[38]^[39]	−	−	−	−	+	−	Split-fat sign Fascicular sign Often have areas of hemosiderin	Schwann cell origin S100+	Biopsy	It causes hearing loss and tinnitus May be associated with NF-2 (bilateral schwannomas)
Primary CNS lymphoma ^[40]^[41]	+	+/−	+/−	−	+	−	Usually deep in the white matter Single mass with ring enhancement	B cell origin Similar to non hodgkin lymphoma (diffuse large B cell)	Biopsy	Usually in young immunocompromised patients (HIV) or old immunocompetent person.
Infectious
Bacterial brain abscess ^[42]^[43]	+	+/−	+/−	+	+	Leukocytosis Elevated ESR Blood culture may be positive for underlying organism	Central hypodense signal and surrounding ring-enhancement in T1 Central hyperintense area surrounded by a well-defined hypointense capsule with surrounding edema in T2	We do not perform biopsy for brain abscess	History/ imaging	The most common causes of brain abscess are Streptococcus and Staphylococcus.
Tuberculosis ^[44]^[3]^[45]	+	+/−	+/−	+	+	Positive acid-fast bacilli (AFB) smear in CSF specimen Positive CSF nucleic acid amplification testing Hyponatremia (inappropriate secretion of antidiuretic hormone) Mild anemia Leukocytosis	Hydrocephalus combined with marked basilar meningeal enhancement	We do not perform biopsy for brain tuberculosis	Lab data/ Imaging	It is associated with HIV infection
Toxoplasmosis ^[46]^[47]	+	+/−	+/−	−	+	Normal CSF	Multifocal masses with ring enhancement Mostly in basal ganglia, thalami, and corticomedullary junction.	We do not perform biopsy for brain toxoplasmosis	History/ imaging	It is associated with HIV infection
Hydatid cyst ^[48]^[3]	+	+/−	+/−	+/−	+	Positive serology (Antibody detection for E. granulosus)	Honeycomb appearance Necrotic area	We do not perform biopsy for hydatid cysts	Imaging	Brain, eye, and splenic cysts may not produce detectable amount of antibodies
CNS cryptococcosis ^[49]	+	+/−	+/−	+	+	Positive CSF antigen testing (coccidioidomycosis) CSF lymphocytic pleocytosis Elevated CSF proteins and lactate Low CSF glucose	Dilated perivascular spaces Basal ganglia pseudocysts Soap bubble brain lesions (cryptococcus neoformans)	We may see numerous acutely branching septate hyphae	Lab data/ Imaging	It is the most common brain fungal infection It is associated with HIV, immunosuppressive therapies, and organ transplants In may happen in immunocompetent patients undergoing invasive procedures ( neurosurgery) or exposed to contaminated devices or drugs Since brain biopsies are highly invasive and may may cause neurological deficits, we diagnose CNS fungal infections based on laboratory and imaging findings
CNS aspergillosis ^[50]	+	+/−	+/−	+	+	Positive galactomannan antigen testing (aspergillosis) CSF lymphocytic pleocytosis Elevated CSF proteins and lactate Low CSF glucose	Multiple abscesses Ring enhancement Peripheral low signal intensity on T2	We may see numerous acutely branching septate hyphae	Lab data/ Imaging	It is associated with HIV, immunosuppressive therapies, and organ transplants In may happen in immunocompetent patients undergoing invasive procedures ( neurosurgery) or exposed to contaminated devices or drugs Since brain biopsies are highly invasive and may may cause neurological deficits, we diagnose CNS fungal infections based on laboratory and imaging findings
Other
Brain metastasis ^[51]^[3]	+	+/−	+/−	+	+	−	Multiple lesions Vasogenic edema	Based on the primary cancer type we may have different immunohistopathology findings.	History/ imaging	Most common primary tumors that metastasis to brain: Lung cancer Renal cell carcinoma Breast cancer Melanoma Gastrointestinal tract If there is any uncertainty about etiology, biopsy should be performed

ABBREVIATIONS

CNS=Central nervous system, AV=Arteriovenous, CSF=Cerebrospinal fluid, NF-2=Neurofibromatosis type 2, MEN-1=Multiple endocrine neoplasia, GFAP=Glial fibrillary acidic protein, HIV=Human immunodeficiency virus, BhCG=Human chorionic gonadotropin, ESR=Erythrocyte sedimentation rate, AFB=Acid fast bacilli, MRA=Magnetic resonance angiography, CTA=CT angiography

References

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↑ Fleetwood, Ian G; Steinberg, Gary K (2002). “Arteriovenous malformations”. The Lancet. 359 (9309): 863–873. doi:10.1016/S0140-6736(02)07946-1. ISSN 0140-6736.
↑ ^3.0 ^3.1 ^3.2 ^3.3 ^3.4 ^3.5 ^3.6 ^3.7 Mattle, Heinrich (2017). Fundamentals of neurology : an illustrated guide. Stuttgart New York: Thieme. ISBN 9783131364524.
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↑ Paulus, Werner (1999). “Classification, Pathogenesis and Molecular Pathology of Primary CNS Lymphomas”. Journal of Neuro-Oncology. 43 (3): 203–208. doi:10.1023/A:1006242116122. ISSN 0167-594X.
↑ Haimes, AB; Zimmerman, RD; Morgello, S; Weingarten, K; Becker, RD; Jennis, R; Deck, MD (1989). “MR imaging of brain abscesses”. American Journal of Roentgenology. 152 (5): 1073–1085. doi:10.2214/ajr.152.5.1073. ISSN 0361-803X.
↑ Brouwer, Matthijs C.; Tunkel, Allan R.; McKhann, Guy M.; van de Beek, Diederik (2014). “Brain Abscess”. New England Journal of Medicine. 371 (5): 447–456. doi:10.1056/NEJMra1301635. ISSN 0028-4793.
↑ Morgado, Carlos; Ruivo, Nuno (2005). “Imaging meningo-encephalic tuberculosis”. European Journal of Radiology. 55 (2): 188–192. doi:10.1016/j.ejrad.2005.04.017. ISSN 0720-048X.
↑ Be NA, Kim KS, Bishai WR, Jain SK (March 2009). “Pathogenesis of central nervous system tuberculosis”. Curr. Mol. Med. 9 (2): 94–9. PMC 4486069. PMID 19275620.
↑ Chinn RJ, Wilkinson ID, Hall-Craggs MA, Paley MN, Miller RF, Kendall BE, Newman SP, Harrison MJ (December 1995). “Toxoplasmosis and primary central nervous system lymphoma in HIV infection: diagnosis with MR spectroscopy”. Radiology. 197 (3): 649–54. doi:10.1148/radiology.197.3.7480733. PMID 7480733.
↑ Helton KJ, Maron G, Mamcarz E, Leventaki V, Patay Z, Sadighi Z (November 2016). “Unusual magnetic resonance imaging presentation of post-BMT cerebral toxoplasmosis masquerading as meningoencephalitis and ventriculitis”. Bone Marrow Transplant. 51 (11): 1533–1536. doi:10.1038/bmt.2016.168. PMID 27348541.
↑ Taslakian B, Darwish H (September 2016). “Intracranial hydatid cyst: imaging findings of a rare disease”. BMJ Case Rep. 2016. doi:10.1136/bcr-2016-216570. PMC 5030532. PMID 27620198.
↑ McCarthy M, Rosengart A, Schuetz AN, Kontoyiannis DP, Walsh TJ (July 2014). “Mold infections of the central nervous system”. N. Engl. J. Med. 371 (2): 150–60. doi:10.1056/NEJMra1216008. PMC 4840461. PMID 25006721.
↑ McCarthy M, Rosengart A, Schuetz AN, Kontoyiannis DP, Walsh TJ (July 2014). “Mold infections of the central nervous system”. N. Engl. J. Med. 371 (2): 150–60. doi:10.1056/NEJMra1216008. PMC 4840461. PMID 25006721.
↑ Pope WB (2018). “Brain metastases: neuroimaging”. Handb Clin Neurol. 149: 89–112. doi:10.1016/B978-0-12-811161-1.00007-4. PMC 6118134. PMID 29307364.

Template:WH Template:WS

Epidemiology and Demographics

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kalsang Dolma, M.B.B.S.[2]

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Overview

An estimated 300,000 people in the US have AVMs, of which 12% (approximately 36,000) will exhibit symptoms that differ greatly in severity.

References

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Risk Factors

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References

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Natural History, Complications and Prognosis

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References

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Diagnosis

Treatment

Case Studies

Case #1

nl:arterioveneuze malformatie

Template:WikiDoc Sources CME Category::Cardiology

[1] Research trials in arterio-venous malformations; Rustam Al-Shahi Salman

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[pmid17056881-6] Rivera PP, Kole MK, Pelz DM, Gulka IB, McKenzie FN, Lownie SP (2006). “Congenital intercostal arteriovenous malformation”. AJR Am J Roentgenol. 187 (5): W503–6. doi:10.2214/AJR.05.0367. PMID 17056881. Unknown parameter |month= ignored (help)

[pmid16534057-7] Shields JA, Streicher TF, Spirkova JH, Stubna M, Shields CL (2006). “Arteriovenous malformation of the iris in 14 cases”. Arch. Ophthalmol. 124 (3): 370–5. doi:10.1001/archopht.124.3.370. PMID 16534057. Unknown parameter |month= ignored (help)

[pmid17939869-8] Sountoulides P, Bantis A, Asouhidou I, Aggelonidou H (2007). “Arteriovenous malformation of the spermatic cord as the cause of acute scrotal pain: a case report”. J Med Case Reports. 1: 110. doi:10.1186/1752-1947-1-110. PMID 17939869.

[KucharczykLemme-Pleghos1985-1] Kucharczyk, W; Lemme-Pleghos, L; Uske, A; Brant-Zawadzki, M; Dooms, G; Norman, D (1985). “Intracranial vascular malformations: MR and CT imaging”. Radiology. 156 (2): 383–389. doi:10.1148/radiology.156.2.4011900. ISSN 0033-8419.

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[:0-3] 3.0 ^3.1 ^3.2 ^3.3 ^3.4 ^3.5 ^3.6 ^3.7 Mattle, Heinrich (2017). Fundamentals of neurology : an illustrated guide. Stuttgart New York: Thieme. ISBN 9783131364524.

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[:02-11] Mattle, Heinrich (2017). Fundamentals of neurology : an illustrated guide. Stuttgart New York: Thieme. ISBN 9783131364524.

[DorwartWara1981-12] Dorwart, R H; Wara, W M; Norman, D; Levin, V A (1981). “Complete myelographic evaluation of spinal metastases from medulloblastoma”. Radiology. 139 (2): 403–408. doi:10.1148/radiology.139.2.7220886. ISSN 0033-8419.

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[BurgerGrahmann1987-14] Burger, P. C.; Grahmann, F. C.; Bliestle, A.; Kleihues, P. (1987). “Differentiation in the medulloblastoma”. Acta Neuropathologica. 73 (2): 115–123. doi:10.1007/BF00693776. ISSN 0001-6322.

[YuhBarkovich2009-15] Yuh, E. L.; Barkovich, A. J.; Gupta, N. (2009). “Imaging of ependymomas: MRI and CT”. Child’s Nervous System. 25 (10): 1203–1213. doi:10.1007/s00381-009-0878-7. ISSN 0256-7040.

[pmid12407316-16] Brunel H, Raybaud C, Peretti-Viton P, Lena G, Girard N, Paz-Paredes A, Levrier O, Farnarier P, Manera L, Choux M (September 2002). “[Craniopharyngioma in children: MRI study of 43 cases]”. Neurochirurgie (in French). 48 (4): 309–18. PMID 12407316.

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[pmid766825-18] Kennedy HB, Smith RJ (December 1975). “Eye signs in craniopharyngioma”. Br J Ophthalmol. 59 (12): 689–95. PMC 1017436. PMID 766825.

[pmid6625640-19] Ahmed SR, Shalet SM, Price DA, Pearson D (September 1983). “Human chorionic gonadotrophin secreting pineal germinoma and precocious puberty”. Arch. Dis. Child. 58 (9): 743–5. PMID 6625640.

[Sano1976-20] Sano, Keiji (1976). “Pinealoma in Children”. Pediatric Neurosurgery. 2 (1): 67–72. doi:10.1159/000119602. ISSN 1016-2291.

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[pmid17964028-22] Sathornsumetee S, Rich JN, Reardon DA (November 2007). “Diagnosis and treatment of high-grade astrocytoma”. Neurol Clin. 25 (4): 1111–39, x. doi:10.1016/j.ncl.2007.07.004. PMID 17964028.

[pmid22819718-23] Pedersen CL, Romner B (January 2013). “Current treatment of low grade astrocytoma: a review”. Clin Neurol Neurosurg. 115 (1): 1–8. doi:10.1016/j.clineuro.2012.07.002. PMID 22819718.

[pmid26849038-24] Smits M (2016). “Imaging of oligodendroglioma”. Br J Radiol. 89 (1060): 20150857. doi:10.1259/bjr.20150857. PMC 4846213. PMID 26849038.

[pmid25943885-25] Wesseling P, van den Bent M, Perry A (June 2015). “Oligodendroglioma: pathology, molecular mechanisms and markers”. Acta Neuropathol. 129 (6): 809–27. doi:10.1007/s00401-015-1424-1. PMC 4436696. PMID 25943885.

[pmid26478444-26] Kerkhof M, Benit C, Duran-Pena A, Vecht CJ (2015). “Seizures in oligodendroglial tumors”. CNS Oncol. 4 (5): 347–56. doi:10.2217/cns.15.29. PMC 6082346. PMID 26478444.

[pmid1642904-27] Zee CS, Chin T, Segall HD, Destian S, Ahmadi J (June 1992). “Magnetic resonance imaging of meningiomas”. Semin. Ultrasound CT MR. 13 (3): 154–69. PMID 1642904.

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[pmid17509660-29] Begnami MD, Palau M, Rushing EJ, Santi M, Quezado M (September 2007). “Evaluation of NF2 gene deletion in sporadic schwannomas, meningiomas, and ependymomas by chromogenic in situ hybridization”. Hum. Pathol. 38 (9): 1345–50. doi:10.1016/j.humpath.2007.01.027. PMC 2094208. PMID 17509660.

[pmid24579662-30] Lonser RR, Butman JA, Huntoon K, Asthagiri AR, Wu T, Bakhtian KD, Chew EY, Zhuang Z, Linehan WM, Oldfield EH (May 2014). “Prospective natural history study of central nervous system hemangioblastomas in von Hippel-Lindau disease”. J. Neurosurg. 120 (5): 1055–62. doi:10.3171/2014.1.JNS131431. PMC 4762041. PMID 24579662.

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[pmid3786729-34] Kucharczyk W, Davis DO, Kelly WM, Sze G, Norman D, Newton TH (December 1986). “Pituitary adenomas: high-resolution MR imaging at 1.5 T”. Radiology. 161 (3): 761–5. doi:10.1148/radiology.161.3.3786729. PMID 3786729.

[pmid22584705-35] Syro LV, Scheithauer BW, Kovacs K, Toledo RA, Londoño FJ, Ortiz LD, Rotondo F, Horvath E, Uribe H (2012). “Pituitary tumors in patients with MEN1 syndrome”. Clinics (Sao Paulo). 67 Suppl 1: 43–8. PMC 3328811. PMID 22584705.

[DonnellyDaly2007-36] Donnelly, Martin J.; Daly, Carmel A.; Briggs, Robert J. S. (2007). “MR imaging features of an intracochlear acoustic schwannoma”. The Journal of Laryngology & Otology. 108 (12). doi:10.1017/S0022215100129056. ISSN 0022-2151.

[pmid9639114-37] Feany MB, Anthony DC, Fletcher CD (May 1998). “Nerve sheath tumours with hybrid features of neurofibroma and schwannoma: a conceptual challenge”. Histopathology. 32 (5): 405–10. PMID 9639114.

[pmid28710469-38] Chen H, Xue L, Wang H, Wang Z, Wu H (July 2017). “Differential NF2 Gene Status in Sporadic Vestibular Schwannomas and its Prognostic Impact on Tumour Growth Patterns”. Sci Rep. 7 (1): 5470. doi:10.1038/s41598-017-05769-0. PMID 28710469.

[HardellHansson_Mild2003-39] Hardell, Lennart; Hansson Mild, Kjell; Sandström, Monica; Carlberg, Michael; Hallquist, Arne; Påhlson, Anneli (2003). “Vestibular Schwannoma, Tinnitus and Cellular Telephones”. Neuroepidemiology. 22 (2): 124–129. doi:10.1159/000068745. ISSN 0251-5350.

[pmid7480733-40] Chinn RJ, Wilkinson ID, Hall-Craggs MA, Paley MN, Miller RF, Kendall BE, Newman SP, Harrison MJ (December 1995). “Toxoplasmosis and primary central nervous system lymphoma in HIV infection: diagnosis with MR spectroscopy”. Radiology. 197 (3): 649–54. doi:10.1148/radiology.197.3.7480733. PMID 7480733.

[Paulus19992-41] Paulus, Werner (1999). “Classification, Pathogenesis and Molecular Pathology of Primary CNS Lymphomas”. Journal of Neuro-Oncology. 43 (3): 203–208. doi:10.1023/A:1006242116122. ISSN 0167-594X.

[HaimesZimmerman1989-42] Haimes, AB; Zimmerman, RD; Morgello, S; Weingarten, K; Becker, RD; Jennis, R; Deck, MD (1989). “MR imaging of brain abscesses”. American Journal of Roentgenology. 152 (5): 1073–1085. doi:10.2214/ajr.152.5.1073. ISSN 0361-803X.

[BrouwerTunkel2014-43] Brouwer, Matthijs C.; Tunkel, Allan R.; McKhann, Guy M.; van de Beek, Diederik (2014). “Brain Abscess”. New England Journal of Medicine. 371 (5): 447–456. doi:10.1056/NEJMra1301635. ISSN 0028-4793.

[MorgadoRuivo2005-44] Morgado, Carlos; Ruivo, Nuno (2005). “Imaging meningo-encephalic tuberculosis”. European Journal of Radiology. 55 (2): 188–192. doi:10.1016/j.ejrad.2005.04.017. ISSN 0720-048X.

[pmid19275620-45] Be NA, Kim KS, Bishai WR, Jain SK (March 2009). “Pathogenesis of central nervous system tuberculosis”. Curr. Mol. Med. 9 (2): 94–9. PMC 4486069. PMID 19275620.

[pmid74807332-46] Chinn RJ, Wilkinson ID, Hall-Craggs MA, Paley MN, Miller RF, Kendall BE, Newman SP, Harrison MJ (December 1995). “Toxoplasmosis and primary central nervous system lymphoma in HIV infection: diagnosis with MR spectroscopy”. Radiology. 197 (3): 649–54. doi:10.1148/radiology.197.3.7480733. PMID 7480733.

[pmid27348541-47] Helton KJ, Maron G, Mamcarz E, Leventaki V, Patay Z, Sadighi Z (November 2016). “Unusual magnetic resonance imaging presentation of post-BMT cerebral toxoplasmosis masquerading as meningoencephalitis and ventriculitis”. Bone Marrow Transplant. 51 (11): 1533–1536. doi:10.1038/bmt.2016.168. PMID 27348541.

[pmid27620198-48] Taslakian B, Darwish H (September 2016). “Intracranial hydatid cyst: imaging findings of a rare disease”. BMJ Case Rep. 2016. doi:10.1136/bcr-2016-216570. PMC 5030532. PMID 27620198.

[pmid25006721-49] McCarthy M, Rosengart A, Schuetz AN, Kontoyiannis DP, Walsh TJ (July 2014). “Mold infections of the central nervous system”. N. Engl. J. Med. 371 (2): 150–60. doi:10.1056/NEJMra1216008. PMC 4840461. PMID 25006721.

[pmid250067212-50] McCarthy M, Rosengart A, Schuetz AN, Kontoyiannis DP, Walsh TJ (July 2014). “Mold infections of the central nervous system”. N. Engl. J. Med. 371 (2): 150–60. doi:10.1056/NEJMra1216008. PMC 4840461. PMID 25006721.

[pmid29307364-51] Pope WB (2018). “Brain metastases: neuroimaging”. Handb Clin Neurol. 149: 89–112. doi:10.1016/B978-0-12-811161-1.00007-4. PMC 6118134. PMID 29307364.

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Arteriovenous malformation

Overview

Historical Perspective

Pathophysiology

Epidemiology and Demographics

Diagnosis

Symptoms

Treatment

Medical Therapy

Surgery

Future or Investigational Therapies

References

Overview

References

References

Overview

Pathophysiology

Genetics

Microscopic Pathology

References

References

Overview

Differentiating arteriovenous malformation from other Diseases

Differentiating arteriovenous malformationfrom other diseases on the basis of seizure, visual disturbance, and constitutional symptoms

References

Overview

References

References

References

Diagnosis

Treatment

Case Studies

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