腰部脊柱管内腫の 3 例

We report three cases of lumbar intraspinal cyst surgically treated. The three cases included two men and a woman, whose ages were 85, 64 and 69 years respectively. MRI, facet arthrograns and pathological findings were reviewed. All cases had nerve root disturbance. MRI revealed existence of two cysts existed at the level of L4-5, and one cyst at L5. Cysts were isointense on T1-weighted image and hyper or isointense on T2-weighted image. Facet arthrography was performed on two cases, and it demonstrated that these cysts communicated with facet joint. Laminoplasty or fenestration was performed, and cysts were resected. Preoperative symptoms improved by resection in all cases. Pathologically, one case was ganglion cyst, and two cases were synovial cyst. Pathological diagnosis of ganglion and synovial cyst were based on the existence of the lining cell, mucoid degeneration, detritus or communication with facet joint. There is no criteria for diagnosis of cyst without lining cell and mucoid degeneration.