Subependymomas are slow-growing tumors and are classified as WHO grade 1 tumors.
Epidemiology
Subependymomas account for 0.51 % of all tumors in the central nervous system and approximately 8 % of all ependymal tumors[^1] [^2].
Etiology
Subependymomas arise from the Ependymal cells in the Ventricles, protrude into the ventricular system, and do not grow invasively.
Diagnosis
Subependymomas are usually an incidental finding on imaging or become symptomatic due to Hydrocephalus. Subependymomas can occur in the Brain as well as the Spinal cord.
Imaging
The gold standard for imaging subependymomas is MRI imaging. On MRI, subependymomas appear as hypo- to hyperintense lesions on T1- and T2-weighted sequences and usually show no or only minimal contrast enhancement[^1] [^2].
Subependymomas typically appear as non-enhancing intraventricular lesions[^1].
Treatment
Subependymomas are slow-growing tumors and can be monitored if they are asymptomatic. If surgical removal is indicated, gross total resection (GTR) is usually curative, and subtotal resection is also generally sufficient due to the slow tumor growth[^1].
