Cryptogenic organising pneumonia
Presented to the GP with chronic cough and had an incidental eosinophilia a year ago
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Patient with organising pneumonia shows a reversed halo pattern (atoll sign) where there are focal round areas of ground-glass attenuation with surrounding crescent or ring shaped consolidation
- Kim SJ, Lee KS, Ryu YH, et al. Reversed halo sign on high-resolution CT of cryptogenic organizing pneumonia: diagnostic implications. Am J Roentgenol AJR 2003; 180:1251–1254.