[Giant thoracolumbar synovial cyst: case report]. / Synovialome géant thoracolombaire: un cas.

METHODS: A case report of a giant thoracolumbar synovial cyst is presented. RESULTS: A 74-year-old woman presented with a chronic lumbar pain associated with pain in the left leg. MR imaging showed a voluminous extradural cyst extending from T12 to L2. The cyst was surgically removed entirely. Microscopic examination revealed a synovial cyst. CONCLUSIONS: In spite of a careful review of the literature, no other description of a giant thoracolumbar synovial cyst developed on three metameric levels was found. The diagnosis was made with a MRI scan combined with microscopic examination. The pathogenesis and therapeutic strategy are discussed.