Presentation
Trauma. To rule out a right hip fracture. Incidental finding on CT scan.
Patient Data
Age: 70 years
Gender: Female
From the case:
Intraosseous pneumatocyst
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A small well-defined lobulated gas-containing left sacral cystic structure with a thin sclerotic margin, abutting the joint. No communication was seen with the adjacent sacroiliac joint.
No bony fracture was seen.
From the case:
Intraosseous pneumatocyst
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Annotated image showing the mean density of the intraosseous lesion (-1125 HU).
Case Discussion
Intraosseous pneumatocysts are usually incidental findings seen as gas-containing cystic structures within the bone, not communicating with the joint. The most common site of involvement is the sacroiliac joints.
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