• Masaya Oda, Toshio Sasajima, Hiroyuki Kinouchi, Masato Sageshima, and Kazuo Mizoi.
• Department of Neurosurgery, Akita University School of Medicine, 1-1-1 Hondo, Akita-city, Akita 010-8543, Japan.
• No Shinkei Geka. 2002 Sep 1; 30 (9): 973-9.

AbstractWe reported a rare case of third ventricular chordoid glioma and reviewed the literature. A 25-year-old male presented with a two-year history of voracious appetite. Three months prior to admission, he developed progressive memory impairment. CT scan showed a well circumscribed, slightly hyperdense mass without calcification in the third ventricle. The 4.5-cm oval mass occupying the anterior part of the third ventricle was homogeniously enhanced on MR images after administration of contrast medium. Small cystic components were present in the periphery of the mass. CT-guided stereotactic biopsy was performed. Microscopically, epithelioid tumor cells were embedded in mucinous stroma containing a lympho-plasmacytic infiltration. The tumor cells were immunoreactive for GFAP and vimentin. The MIB-1-positive rate was 1.2%. The histological diagnosis was a chordoid glioma. One month after the biopsy, a right frontal craniotomy was performed to remove the tumor via the anterior transcallosal interfornitial approach. The tumor arising from the anterior part of the third ventricle wall was soft, mildly vascular and light-grayish. The tumor was completely resected. The histological findings were identical with those of the biopsy specimens. Postoperatively, the patient developed diabetes inspidus, hyperthermia, worsening memory impairment, and transient hyponatremia. The patient's symptoms gradually improved and follow-up MR images showed no evidence of recurrent tumor 17 months after the resection. Despite low-grade appearance, attachment of the tumor to the hypothalamus preclude complete resection, and this may result in tumor recurrence and less favorable prognosis in the current reports. Early detection and aggressive resection followed by stereotactic radiotherapy are important in the management of chordoid glioma.

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