Chest CT scan may be helpful in the diagnosis of aspergillosis. Findings on chest CT scan suggestive of aspergillosis include a well formed cavity, a central soft tissue attenuating oval shaped, well circumscribed mass surrounded by an cresent of air (Monad sign).^[1]

• Chest CT scan may be helpful in the diagnosis of aspergillosis.^[1]
• Findings on chest CT scan suggestive of aspergilloma include:

• Well formed cavity
• A central soft tissue attenuating oval, well circumscribed mass
• Surrounded by an cresent of air (Monad sign)

• The mass may illustrate mobility as the patients change their position.
• On certain occasion the mass may entirely fill the cavity, thus it takes on the shape of the cavity, loses its mobility, and obliterates the surrounding air crescent.
• Marked enlargement of the bronchial arteries that supply the wall of the adjacent respiratory tracts
• Thickening of the adjacent pleura may be present
• Findings on chest CT scan suggestive of allergic bronchopulmonary aspergillosis include:^[2]

• Fleeting pulmonary alveolar opacities
• Centrilobular nodular opacities representing dilated and opacified bronchioles
• Bronchiectasis
• Bronchial wall thickening
• Honey comb appearance

• 
  Chest CT scan demonstrating a well rounded mass located inside a cavity of the left lung, and surrounded by a crescent of air
• 
  Chest CT scan demonstrating a well rounded mass located inside a cavity of the right lung, and surrounded by a crescent of air
• 
  Chest CT (coronal lung window view) demonstrates an extensive cavitation in the right lung apex, within which there is a rounded mass soft tissue
• 
  Allergic bronchopulmonary aspergillosis

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