Pneumatocyst of iliac bone
18F-FDG PET/CT for cancer follow-up
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Gas containing cystic structure with thin sclerotic irregular margin in the iliac component of the left sacroiliac joint. The cysts does not communicate with the joint and does not show abnormal FDG uptake.
The differential diagnosis of this finding includes osteomyelitis from organisms producing gas, but the absence of high FDG uptake within the cysts excludes the diagnosis of infection.