Intraventricular tumors around the foramen of Monro: Neuroimaging features and differential diagnosis

S. Nishio, T. Morioka, S. Suzuki, M. Fukui, R. Kira

Research output: Contribution to journalArticlepeer-review


The clinical and neuroimaging features of 12 patients with lateral ventricular tumors located around the foramen of Monro were reviewed retrospectively with special emphasis on the differential diagnoses. In this series, there were 4 neurocytomas, 3 subependymal giant cell astrocytomas (SEGAs), 3 subependymomas, and one each of pilocytic astrocytoma and malignant astrocytoma. The mean age of patients with neurocytoma was 30.5 years, with SEGA 9.7 years, and with subependymoma 57 years. On neuroimaging studies, all tumors were well-circumscribed, and most of them appeared nodular in shape. On computed tomography, neurocytomas showed heterogeneous density, all SEGAs were isodense, and all subependymomas were lowdense with the brain. On magnetic resonance imaging, the signal characteristics of the 4 neurocytomas and 3 SGCAs were nonspecific, while 2 subependymomas were hypointense on T1-weighted images and hyperintense on T2-weighted images. After administration of contrast medium, all tumors except the subependymomas showed contrast enhancement. Since there are no absolutely specific features for each tumor type, differential diagnosis should be based not only on these neuroimaging features but also on clinical features such as age of the patient and neurocutaneous symptoms.

Original languageEnglish
Pages (from-to)745-752
Number of pages8
JournalJapanese Journal of Clinical Radiology
Issue number6
Publication statusPublished - 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging


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