Cysticercosis is a parasitic disease caused by the larvae of Taenia Solium. Its usual locations are intestine, subcutaneous tissue, muscle, and central nervous system including the spinal cord. Although neurocysticercosis in brain is very common in endemic area, the spinal lesions are rarely found in the clinical practice. In the lumbar lesion, cysticercosis may show symptoms mimicking herniated nucleus pulposus. Recently, we experienced a case of herniated nucleus pulposus in L4-5, disk associated with suspected intradural mass by preoperative myelogram and CT scan. Intraoperatively we found multiple cystic masses floating in the subarachnoid space, which were confirmed to be the cysticercosis by the histopathological and serological studies. Any focus of cerebral cysticercosis could not be found in CT scan and MRI of the brain. The final diagnosis was isolated spinal subarachnoidal cysticercosis without cerebral involvement, which has been reported to be a very rare form. Ten months after the surgical removal of the intradural lesion and praziquantel administration, the patient showed full recovery from the disease.