Findings on a Positron Emission Tomography (PET-CT) scan suggestive of diagnostic of incidentaloma. Cancer cells have an increased requirement for glucose and take up more glucose and deoxyglucose than normal cells. Standard uptake value (SUV) values have been utilized to differentiate between benign and malignant adrenal lesions. It may be helpful in the diagnosis of incidentaloma in selected patients; those with a history of malignancy or those in which CT densitometry or washout analysis is inconclusive or suspicious for malignancy because of their high sensitivity for detecting malignancy.

• FDG–PET is a nuclear medicine modality that provides quantitative tomographic images after intravenous injection of a beta-radiation-emitting radiotracer (18-Fluorine) used to label 2-deoxy-d-glucose rendering fluoro-deoxyglucose (FDG).^[1]
• Glucose and deoxyglucose enter cells via cell glucose transporters and undergo phosphorylation. When glucose undergoes further enzymatic breakdown, deoxyglucose is trapped in the intra-cellular compartments.
• Cancer cells have an increased requirement for glucose and take up more glucose and deoxyglucose than normal cells.^[2]
• SUV values have been utilized to differentiate between benign and malignant adrenal lesions.
• It may be helpful in the diagnosis of incidentaloma in selected patients; those with a history of malignancy or those in which CT densitometry or washout analysis is inconclusive or suspicious for malignancy because of their high sensitivity for detecting malignancy.^[3]
• 18F-FDG is not a specific marker for cancer cells but a marker only for increased glucose metabolism so the uptake can also be increased in cells with an increased energy requirement due to conditions other than cancer.^[4]