Abstract
We describe here the finding of a huge perineurial cyst which eroded the sacral body. On MRI examination, a huge cyst occupied the space within the sacral spinal canal. On myelography, however, the cyst was not filled with contrast medium immediately after dye injection. Since the patient was disabled by pain, we resected the cyst microscopically. Histological examination revealed neurofibrils in the wall of the cyst. Based on these and myelographic findings, perineurial cyst was diagnosed. Surgical indications for this lesion are still controversial since most are asymptomatic. It is our opinion that if sacral cystic lesions are large enough to erode sacral bone nearly to the retroperitoneal space or sacro-iliac joint, they should be surgically resected using operative microscope.
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