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Diagnosis: Supracondylar fracture with posterior fat pad sign

Modality: X-Ray

Findings: The posterior fat pad sign is indicative of a likely fracture. The x-ray demonstrates a lucency of fat located in the olecranon fossa on a lateral view of the elbow. Without a fracture, normally, the posterior fat pad would not be visualized. In setting of trauma, the posterior fat pad sign indicates an occult non-displaced fracture – and in children, would be supracondylar fracture.

Credit: Case submitted by Dr. Wael Nemattalia to radRounds Radiology Network