Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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A Case of Intradural-Extramedullary Form of Primary Spinal Cysticercosis Misdiagnosed as an Arachnoid Cyst

  • Yoo, Minwook (Department of Neurosurgery, Spine Center, Seoul National University Bundang Hospital, Seoul National University College of Medicine) ;
  • Lee, Chang-Hyun (Department of Neurosurgery, Spine Center, Seoul National University Bundang Hospital, Seoul National University College of Medicine) ;
  • Kim, Ki-Jeong (Department of Neurosurgery, Spine Center, Seoul National University Bundang Hospital, Seoul National University College of Medicine) ;
  • Kim, Hyun-Jib (Department of Neurosurgery, Spine Center, Seoul National University Bundang Hospital, Seoul National University College of Medicine)
  • Received : 2013.06.26
  • Accepted : 2014.04.15
  • Published : 2014.04.28
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Abstract

We describe a rare case of intradural-extramedullary primary spinal cysticercosis. A 42-year-old man visited our institute for lower back pain. He denied having consumed raw meet. Magnetic resonance (MR) images revealed an intradural pure cystic mass at the L3-L4 level. A radiologic diagnosis of spinal arachnoid cyst was established. Three years later, he complained of aggravated back pain, and follow-up MR examination showed a markedly expanded cyst, occupying the subarachnoid space from the T11 to the S1 level. L2 hemilaminectomy was performed, and a yellowish infected cyst bulged out through the dural opening. The cyst was removed en bloc. The histopathological findings of the cyst were consistent with parasitic infection. Serum enzyme-linked immunosorbent assay (ELISA) confirmed the presence of spinal cysticercosis. As there was no intracranial lesion, the final diagnosis was primary spinal cysticercosis, which is very rare. MR imaging is a sensitive diagnostic tool for detecting cystic lesions in the spine; however, it is difficult to distinguish cysticercosis from non-infectious cysts such as an arachnoid cyst without using gadolinium enhancement. Clinicians treating spinal cysts with an unusual clinical course should include cysticercosis as a differential diagnosis. We recommend contrast-enhanced MR imaging and serum ELISA in the diagnostic work-up of such cases.

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References

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