Subependymoma

Subependymoma is a rare, slow-growing brain tumor classified as a World Health Organization (WHO) grade I neoplasm. It arises from the ependymal lining of the ventricular system, most commonly occurring in the fourth ventricle and the lateral ventricles. These tumors are composed of clusters of glial tumor cells embedded in an abundant fibrillary matrix and are considered benign in the vast majority of cases. Subependymomas primarily affect the central nervous system and are often discovered incidentally during neuroimaging or at autopsy. Many subependymomas are asymptomatic and require no treatment. When symptoms do occur, they are typically related to obstruction of cerebrospinal fluid (CSF) flow, leading to obstructive hydrocephalus. Patients may present with headaches, nausea, vomiting, gait disturbances, dizziness, and cognitive changes. In some cases, particularly with fourth ventricular tumors, patients may experience cranial nerve dysfunction or ataxia. Symptomatic tumors located in the lateral ventricles may cause symptoms related to increased intracranial pressure. The primary treatment for symptomatic subependymoma is surgical resection, which is generally curative. Complete surgical removal is associated with an excellent prognosis, and tumor recurrence after gross total resection is rare. For asymptomatic tumors discovered incidentally, a conservative approach with periodic imaging surveillance is typically recommended. Radiation therapy and chemotherapy are generally not required given the benign nature of these tumors. The overall prognosis is favorable, with most patients experiencing long-term survival following appropriate management.

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