Fluid-Fluid Levels in Aneurysmal Bone Cysts

An 11-year-old girl complained about persistent thoracolumbar junction pain. Magnetic resonance imaging revealed a lesion in the body of L1. Biopsy confirmed the lesion as an aneurysmal bone cyst. Several endovascular embolization procedures were attempted, with poor results. The lesion grew progressively over the next 5 months, extending into the posterior elements and surrounding soft tissues and encasing the spinal cord. Pain increased, making it impossible for the patient to sit for prolonged periods or ambulate long distances.

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