Case contributed by Dr Ian Bickle


The middle aged female on chemotherapy for a known haematological malignancy is generally unwell with a fever.

Patient Data

Age: 45 years
Gender: Female

Round soft tissue density surrounded by semicircular lucency, noted in the right upper zone suggestive of air crescent sign of invasive aspergillosis.

Scanogram to represent a CXR ( original CXR could not be traced)

Annotated image

Annotation illustrating the origin of the term - the air crescent sign


Right upper lobe cavity with a 'ball' of fungus within.  Consolidation surrounding the cavity.

Case Discussion

In invasive fungal infections the nodule is composed of necrosed tissue, later this necrotic nodule is reabsorbed peripherally and retracted and air gets trapped inside the nodule and give rise to air crescent.

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Case information

rID: 26223
Published: 7th Dec 2013
Last edited: 14th Aug 2019
System: Chest
Inclusion in quiz mode: Included

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