Aspergilloma: with Monod sign

Case contributed by Dr Ian Bickle


Elderly patient with past history of TB. Worsening respiratory symptoms and haemoptysis.

Patient Data

Age: 75
Gender: Female
Modality: CT

Bilateral upper lobe cavities.   The left upper lobe cavity contains a soft tissue mass with a crescent of surrouning air.

Scarring, pleural thickening and bronchiectasis in both lungs.

No significant mediastinal abnormality.

Modality: Annotated image

Left upper lobe cavity containing an asperilloma (red circle).

Case Discussion

An aspergilloma is one form of pulmonary aspergillosis.  This is a 'ball' of fungus which forms in a pre-existing cavity in the lungs.

The appearances are term the Monod sign which simply describes the air that surrounds a mycetoma (most commonly an aspergilloma) in a pre existing pulmonary cavity.  It is often used interchangably with the 'air crescent sign'.

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Case Information

rID: 44737
Case created: 3rd May 2016
Last edited: 4th May 2016
System: Chest
Inclusion in quiz mode: Included

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