Version June 2024
| Extent of tumor* | |
| T1 | Tumor less than 3 cm in diameter |
| T2 | Tumor greater than 3 cm in diameter |
| T3a | Tumor greater than 3 cm in diameter with extension into the aqueduct of Sylvius and/or the foramen of Luschka |
| T3b | Tumor greater than 3 cm in diameter with unequivocal extension into the brain stem |
| T4 | Tumor greater than 3 cm in diameter with extension up past the aqueduct of Sylvius and/or down past the foramen magnum |
| No consideration is given to the number of structures invaded or the presence of hydrocephalus. | |
| T3b can be defined by intraoperative demonstration of tumor extension into the brain stem in the absence of radiographic evidence. | |
| Degree of metastasis | |
| M0 | No evidence of gross subarachnoid or hematogenous metastasis |
| M1 | Microscopic tumor cells found in the cerebrospinal fluid |
| M2 | Gross nodular seeding demonstrated in the cerebellar/cerebral subarachnoid space or in the third or lateral ventricles |
| M3 | Gross nodular seeding in the spinal subarachnoid space |
| M4 | Metastasis outside the cerebrospinal axis |
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