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Air crescent sign

From Wikipedia, the free encyclopedia

Not to be confused with the crescent sign.
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 diagnosisAspergilloma

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] It is also referred as Monad sign.[3]

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  • CT Scan -- Lungs "tree in bud" Sign
  • Chest -- CT scan Monod sign
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Transcription

Additional images

Sagittal reformat from a CT scan of the chest showing air crescent sign in a patient with invasive fungal infection. There is a rounded cavity in the apical right upper lobe, with a non-dependant soft-tissue nodule within it. Also there is some subtle ground-glass opacity surrounding the lesion.

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.
  3. ^ "Pulmonary aspergillosis". Mediconotebook. Retrieved 29 May 2015.

External links

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This page was last edited on 12 December 2020, at 06:49
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