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Journal of Korean Neurosurgical Society 1999;28(1): 123-129.
Primitive Neroectodermal Tumor in the Cauda Equina Region.
Jeong Man Lee, Bong Arm Rhee, Jong Tae Park, Young Jin Lim, Tae Sung Kim, Won Leem, Gook Ki Kim
Department of Neurosurgery, School of Medicine, Kyung Hee University, Seoul, Korea.
We report a malignant peripheral primitive neuroectodermal tumor (PNET) that originated in the cauda equina in a young adult, After gross total excision of the tumor, radiotheraphy was followed. The tumor had the typical appearance of a PNET with small, round cell. It stained positively for the neuron-specific enolase(NSE) conforming its neural origin and negatively for cytokeratin, glial fibrillary acidic protein(GFAP ) and S-100 protein. Three months later, MRI showed almost total obstruction at the level o f the L/L interspace caused by a mass occupying the spinal canal and extending into the L/S foramen on the right. Sixteen months after commencement of radiotherapy, severe left sciatica developed and MRI showed involvement of the both ilii and right femur with a large soft tissue mass extending into the pelvis. Palliative radiotherapy was administered but the patient died four months later.
Key Words: Primitive neuroectodermal tumor(PNET); Cauda equina; Peripheral
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