Intracranial Subependymoma
see Intraventricular Subependymoma.
Intraparenchymal subependymomas are extremely rare; only 6 cases have been reported in English literature. All of them were located in the supratentorial region 1) 2) 3) , and there has been only one report of infratentorial subependymoma 4).
Intracranial subependymomas are rare, mostly incidentalomas and therefore did not receive much attention in previous literature.
Many supratentorial subependymomas appear to be centered in the cortex or subcortical white matter. Therefore, a lack of ventricular involvement does not exclude subependymoma from the differential diagnosis.
By being classified as benign grade I in the World Health Organization Classification of Tumors of the Central Nervous System, they are given a special status compared to the other ependymal tumors. Tumor recurrences are a rarity, spinal “drop metastases” do not occur. While etiological, pathological and therapeutic characteristics have been subject of several publications over the last few decades and have meanwhile been well studied, the imaging characteristics are much less well received 5).