Abstract
Malignant Rhabdoid Tumor (MRT) is a rare neoplasm which usually arises from the kidney of infants. Extrarenal MRT is also known to occur in other organs or soft tissue. We report a case of retroperitoneal MRT which developed in the paravertebral region and invaded into the intrathecal sac through the intervertebral foramen. A twenty seven year old female who had developed severe sciatica ten months earlier was referred to our hospital. MR imaging disclosed no evidence of spinal tumor. Three months later, a mass in intrathecal sac at the level of L4/5 vertebra was seen. Postmyelogram CT scan revealed an intradural mass at the same level. Surgical treatment was performed to the intrathecal region. Histological and immunohistochemical examinations revealed is as MRT.
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