Lumbar vertebral aneurysmal bone cyst
Tender lumbar spine following a fall. X-ray to rule out a fracture.
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There is an expansile, bubbly lesion seen arising from the posterior elements on the left side of L3. The cortex is intact and the lesion demonstrates internal lumen septae. The lesion is benign in appearance, consistent with an aneurysmal bone cyst. The differential diagnosis includes osteoblastoma and osteochondroma, however these are less likely.
Imaging is almost pathognomonic but it is conceivable that an unusual appearing other entity could have similar appearances. Imaging carried out three years later show no change, reinforcing this point.