The diagnosis is based on tissue, e.g. a biopsy. Histologically<unk> s consistent of microcystic spaces and bland appearing cells without appreciable nuclear atypia or mitoses. The nuclei tend to form clusters. On a CT, it often shows a less dense to equally dense mass. If it is big, it may have parts that are cystic or calcific. In 50-60% of cases, the tumor is in the fourth ventricle, while the second most common (30-40% of cases) location is the side ventricles. It is rare for it to be in the third ventricle or the central canal of the spinal cord.
Subependymoma
Neurothekeoma
Central neurocytoma
Subependymal giant cell astrocytoma
Ependymoma
Ganglioglioma
Pinealoma
Frontal horn cyst