air meniscus sign

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A crescent radiolucency bordering a mass lesion, classically seen in pulmonary hydatid cysts, in which air enters the cyst forming a radiolucency between the outer layer—host—and the inner layer—hydatid membrane—of Echinococcus granulosus
The most common air meniscus in ultrasonography is caused by Aspergillus fumigatus; an air meniscus can be seen on CT scans of the oesophago-gastric junction due to submucosal haematomas of the oesophagus. It may also be seen in lung abscesses, tumours, hematomas, granulomatous infections and Rasmussen’s aneurysm

air meniscus sign

Imaging A crescent-shaped radiolucency bordering a mass lesion, classically seen in pulmonary hydatid cysts, where air enters the cyst forming a radiolucency between the outer layer–host and the inner layer–hydatid membrane of.Echinococcus granulosus: the most common AMS in ultrasonography is caused by Aspergillus fumigatus
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sup][3],[4] The radiological signs include air crescent sign and finger-in-glove appearance and movement of the fungus ball within the cavity when comparing upright and decubitus, which strongly suggested the diagnosis of pulmonary aspergilloma.
CONCLUSIONS: Rasmussen's aneurysm should be considered in the differential diagnosis of air crescent sign both in chest radiograph and plain CT.
86,87) The air crescent sign is often considered characteristic of retraction of infected lung in invasive aspergillosis (Figure 18).
Adeno-carcinoma of the lung presenting as a mycetoma with an air crescent sign.
Air crescent sign was more common in bacterial pneumonia (24) than in aspergillosis (6).
In current study cases, in aspergillosis, air crescent sign was seen 2(3.