These tumours are small, no more than two centimeters across, coming from the ependyma. The best way to distinguish it from a subependymal giant cell astrocytoma is the size.
Subependymoma
Neurothekeoma
Central neurocytoma
Subependymal giant cell astrocytoma
Ependymoma
Ganglioglioma
Pinealoma
Frontal horn cyst