Air crescent sign - Misplaced Pages

Not to be confused with the crescent sign. Medical condition

Air crescent sign

The arrows denote an ill-defined nodular opacity in medial aspect of right upper lobe with ill-defined rim of lucency surrounding it
Differential diagnosis	Aspergilloma

In radiology, the air crescent sign is a finding on chest radiograph and computed tomography that is crescenteric and radiolucent, due to a lung cavity that is filled with air and has a round radiopaque mass. Classically, it is due to an aspergilloma, a form of aspergillosis, that occurs when the fungus Aspergillus grows in a cavity in the lung. It is also referred as Monad sign.

Additional images

Abramson S (January 2001). "The air crescent sign". Radiology. 218 (1): 230–2. doi:10.1148/radiology.218.1.r01ja19230. PMID 11152807.
Curtis AM, Smith GJ, Ravin CE (October 1979). "Air crescent sign of invasive aspergillosis". Radiology. 133 (1): 17–21. doi:10.1148/133.1.17. PMID 472287.
Goel, Ayush. "Pulmonary aspergillosis". Mediconotebook. Retrieved 29 May 2015.

v t e Radiologic signs
Cardiovascular	Aortic unfolding Dense artery sign Halo sign
Respiratory	Air crescent sign Deep sulcus sign Golden S sign Hampton hump Kerley lines Peribronchial cuffing Sail sign of the chest Silhouette sign Steeple sign Thumbprint sign Traction bronchiectasis Tree-in-bud sign Westermark sign
Urogenital	Canga's bead symptom
Musculoskeletal	Crescent sign Fabella sign Fat pad sign/Sail sign of the elbow Osteopathia striata
Gastrointestinal	Cupola sign Double bubble Endoexoenteric Football sign Hampton's line Hot quadrate sign Mumoli's sign Omental cake Pneumatosis intestinalis Rigler's sign Sentinel loop
Neurological	Hyperdense middle cerebral artery

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