Intraosseous pneumatocyst

Case contributed by Anton Aubanell Creus


Abdominal pain. Suspecting an appendicitis we performed an US, and later a CT scan with this incidental finding.

Patient Data

Age: 75 years
Gender: Female

In this CT scan with bone window, we can see a well-defined lesion with gas density in the right sacrum that corresponds to an intraosseous pneumatocyst, an incidental finding.

Case Discussion

A well-defined bone lesion with very low density (approximately gas) suggests an intraosseous pneumatocyst. Differential diagnosis should consider osteomyelitis and osteonecrosis.

Restricting oneself to a subjective assessment on a bone window, intraosseous lipoma might be volunteered as the diagnosis, illustrating the importance of measuring the attenuation of the lesion, showing it is gas, and not fat.

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Case information

rID: 69558
Published: 15th Jul 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included
Institution: hospital universitari vall d'hebron

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