Abstract
We report a case of intraspinal synovial cyst with lumber spondylolysis. A healthy 17-year-old man suffered low back pain in combination with dysethesia of the left lower limb. Radiographs and CT of the lumber spine demonstrated bilateral L5 spondylolysis. However, the facet joints were devoid of degenerative changes. MRI showed development of a cystic legion compressing the thecal sac at the L4-5 level. Laminectomy was performed and the cyst was resected. It lay posterior to the nerve roots and its base was related to the L4-5 facet joint. Histologically, a cyst wall of fibrous tissue with synovial lining cells and evidence of inflammation with granulation tissue were seen. The patient's symptoms disappeared completely after surgery. Hypermobility of the facet joint is apparently a predisposing factor of cyst formation.
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