Table 1.
Distribution of histopathological subgroups by geographical region or by health region providing the initial treatment
| Histopathology | Belonging to which geographical health region; n, (%) | Initial treatment in which health region; n, (%) | ||
|---|---|---|---|---|
| Low-volume regions | High-volume region | Low-volume regions | High-volume region | |
| Pilocytic astrocytomas | 74 (19.9) | 77 (17.3) | 66 (22.0) | 85 (16.5) |
| Grade II astrocytomas | 35 (9.4) | 56 (12.6) | 30 (10.0) | 61 (11.8) |
| Anaplastic astrocytomas | 4 (1.1) | 5 (1.1) | 4 (1.3) | 5 (1.0) |
| Glioblastomas | 14 (3.8) | 11 (2.5) | 14 (4.7) | 11 (2.1) |
| Oligodendrogliomas | 5 (1.3) | 8 (1.8) | 4 (1.3) | 9 (1.7) |
| Mixed gliomas | 10 (2.7) | 16 (3.6) | 9 (3.0) | 17 (3.3) |
| Ependymal cell tumors | 20 (5.4) | 22 (5.0) | 18 (6.0) | 24 (4.7) |
| PNET/medulloblastomas | 66 (17.7) | 59 (13.3) | 54 (18.0) | 71 (13.8) |
| Other gliomas | 14 (3.8) | 15 (3.4) | 12 (4.0) | 17 (3.3) |
| Neuroepitelimatous neoplasms | 23 (6.2) | 30 (6.8) | 17 (5.7) | 36 (7.0) |
| Choroid plexus tumors | 3 (0.8) | 19 (4.3) | 1 (0.3) | 21 (4.1) |
| Pineal parenchymal tumors | 8 (2.2) | 2 (0.5) | 7 (2.3) | 3 (0.6) |
| Nerve sheath tumors | 4 (1.1) | 0 (0) | 4 (1.3) | 0 (0) |
| Meningiomas | 8 (2.2) | 3 (0.7) | 7 (2.3) | 4 (0.8) |
| Blood vessel tumors | 5 (1.3) | 2 (0.5) | 4 (1.3) | 3 (0.6) |
| Other mesenchymal non-meningothelial tumors | 13 (3.5) | 30 (6.8) | 3 (1.0) | 40 (7.8) |
| Primary intracranial adenomas/adenocarcinomas | 5 (1.3) | 10 (2.3) | 5 (1.7) | 10 (1.9) |
| Craniopharyngiomas | 15 (4.0) | 20 (4.5) | 12 (4.0) | 23 (4.5) |
| Germ cell tumors | 1 (0.3) | 2 (0.5) | 1 (0.3) | 2 (0.4) |
| Other tumors | 35 (9.4) | 39 (8.8) | 24 (8.0) | 50 (9.7) |
| Unspecified tumors | 10 (2.7) | 18 (4.1) | 4 (1.3) | 23 (4.5) |
| Total | 372 (100) | 444 (100) | 300 (100) | 516 (100) |