Table 3.
Histopathological types of the 1,033 intramedullary tumors in Japan, data arranged in decreasing order of frequency
| Type | No. of cases (%) |
|---|---|
| Ependymoma | 361 (35.0) |
| Hemangioblastoma | 196 (18.9) |
| Astrocytoma | 168 (16.2) |
| Cavernous malformations | 160 (15.4) |
| Subependymoma | 22 (2.1) |
| Metastasis | 21 (2.0) |
| Capillary hemangioma | 16 (1.5) |
| Lymphoma | 13 (1.3) |
| Schwannoma | 12 (1.2) |
| Embryonal tumors (medulloblastoma, PNET, ATRT) | 8 (0.8) |
| Solitary fibrous tumor | 5 (0.5) |
| Germ Cell tumors (germinoma, mature teratoma, yolk sac tumor) | 5 (0.5) |
| Gangliocytoma, Ganglioglioma | 5 (0.5) |
| Neurenteric cyst | 4 (0.4) |
| Rosette-forming glioneuronal tumor | 3 (0.3) |
| Malignant peripheral nerve sheath tumor | 2 (0.2) |
| Neurofibroma | 1 (0.1) |
| Pineoblastoma | 1 (0.1) |
| Paraganglioma | 1 (0.1) |
| Glioependymal cyst | 1 (0.1) |
| Meningioma | 1 (0.1) |
| Granuloma | 2 (0.2) |
| Sclerosing epithelioid fibrosarcoma | 1 (0.1) |
| Dermoid cyst | 1 (0.1) |
| Central neurocytoma | 1 (0.1) |
| Undiagnosed | 22 (2.1) |
PNET, primitive neuroectodermal tumor; ATRT, atypical teratoid/rhabdoid tumor.