A rare case of an expansile spinopelvic aneurysmal bone cyst managed with embolization, excision, and fusion.

Background: Aneurysmal bone cysts (ABC) are benign osteolytic lesions of the metaphyseal regions of long bones that typically contribute to rapid bony expansion. Here, we present an ABC involving the spinopelvic region in a 15-year-old male that required embolization, surgical excision, and fusion.

Case Description: A 15-year-old male, presented with gradually progressive painful lower back swelling of 4 months' duration. Once the diagnosis of an ABC was established based on a combination of X-ray, MR, and CT studies, he underwent selective arterial embolization, extended surgical excision (i.e. curettage), with a posterior fusion. Two years postoperatively, the patient remained neurologically intact without radiographic evidence of lesion recurrence.

Conclusion: Large expansile ABC involving the vertebral bodies should be managed with preoperative selective arterial embolization, surgical decompression/curettage, and spinopelvic fixation.