Air crescent sign
Air Crescent Sign
The Air Crescent Sign (pronunciation: /ɛər krɛsənt saɪn/) is a radiological sign often observed in radiological examinations. It is typically associated with invasive aspergillosis, a severe infection caused by the Aspergillus fungus.
Etymology
The term "Air Crescent Sign" is derived from the distinctive crescent-shaped air space that forms around a mass in the lungs during the recovery phase of invasive aspergillosis. The "crescent" refers to the shape of the air space, while "air" refers to the radiolucent nature of the sign on imaging.
Description
The Air Crescent Sign is a radiological finding seen in the recovery phase of invasive aspergillosis. It is characterized by a crescent of air that forms around a necrotic mass in the lungs. This sign is typically seen on computed tomography (CT) scans of the chest.
The Air Crescent Sign is considered pathognomonic for invasive aspergillosis, meaning it is a sign whose presence is indicative of a particular disease. However, it can also be seen in other conditions such as angioinvasive pulmonary aspergillosis, chronic necrotizing pulmonary aspergillosis, and certain types of lung cancer.
Related Terms
- Aspergillosis: A severe infection caused by the Aspergillus fungus.
- Radiology: The medical specialty that uses medical imaging to diagnose and treat diseases within the body.
- Computed Tomography: A type of imaging that uses special x-ray equipment to make cross-sectional pictures of the body.
- Angioinvasive Pulmonary Aspergillosis: A severe form of aspergillosis that affects the blood vessels in the lungs.
- Chronic Necrotizing Pulmonary Aspergillosis: A long-term condition where the Aspergillus fungus causes inflammation and damage to the lungs.
- Lung Cancer: A type of cancer that begins in the lungs.
External links
- Medical encyclopedia article on Air crescent sign
- Wikipedia's article - Air crescent sign
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