J Korean Neurosurg Soc.  2011 Sep;50(3):264-267. 10.3340/jkns.2011.50.3.264.

A Dumbbell-Shaped Meningioma Mimicking a Schwannoma in the Thoracic Spine

Affiliations
  • 1Department of Neurosurgery, Research Institute of Clinical Medicine, Institute for Medical Science, Chonbuk National University Medical School/Hospital, Jeonju, Korea. spineeun@chonbuk.ac.kr

Abstract

A 50-year-old man presented bilateral hypesthesia on and below the T6 dermatome and paresthesia. Magnetic resonance imaging (MRI) showed an intraspinal extradural tumor, which located from the 6th thoracic vertebral body to the upper margin of the 7th vertebral body, continuing dumbbell-like through the intervertebral foramen into the right middle thorax suggesting a neurogenic tumor (neurofibroma or neurilemmoma). With the patient in a prone position, we exposed and excised the tumor via a one stage posterior approach through a hemi-laminictomy of T6. Histologic examination showed a grade 1 meningothelial meningioma, according to the World Health Organization classification. Initially, we assumed the mass was a schwannoma because of its location and dumbbell shape. However, the tumor was actually a meningioma. Postoperatively, hypesthesia resolved completely and motor power of the leg gradually full recovered. A postoperative MRI revealed no evidence of residual tumor.

Keyword

Meningioma; Schwannoma; Dumbbell; Spinal neoplasms

MeSH Terms

Classification
Humans
Hypesthesia
Leg
Magnetic Resonance Imaging
Meningioma*
Middle Aged
Neoplasm, Residual
Neurilemmoma*
Paresthesia
Prone Position
Spinal Neoplasms
Spine*
Thorax
World Health Organization
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