Aneurysmal bone cysts involving the spine are rare lesions comprising 1.4% of all bone tumours. They are benign primary tumours of bone. Most commonly, 20% of them are localized in the lumbar spine, involving the posterior elements in approximately 60% of cases. They may involve three or more adjacent vertebrae. Radiological investigation reveals an expansile, osteolytic cavity with strands of bone forming a bubbly appearance, with thin and blown out cortex.
Total excision is possible, but when it is not feasible, curettage provides a high rate of cure. However, tumours in 13% of cases. Occasionally the cysts, become quiescent and incidental findings at necropsy have been reported.
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