Air crescent sign

Not to be confused with the 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.

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.[1] Classically, it is due to an aspergilloma, a form of aspergillosis, that occurs when the fungus Aspergillus grows in a cavity in the lung.[2]

References

  1. ↑ Abramson S (January 2001). "The air crescent sign". Radiology 218 (1): 230–2. doi:10.1148/radiology.218.1.r01ja19230. PMID 11152807.
  2. ↑ 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.

External links