A 78-year-old man was referred to our department with severe low back pain and gait disturbance. Lumbar magnetic resonance imaging (MRI) showed a large, well-circumscribed mass isointense with cerebrospinal fluid on T1- and T2-weighted imaging at the conus level. Arachnoid cyst without performing contrast-enhanced MRI was initially diagnosed. Intraoperative observation and postoperative histopathological examination revealed totally cystic schwannoma. Contrast-enhanced MRI is very important for the diagnosis of this rare tumor and should have been performed in this case.
Key words: Totally cystic schwannoma, arachnoid cyst, magnetic resonance imaging.
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