Imaging characteristics of PFA-2c ependymomas compared with other PFA-2 subtypes and all other PFA subtypesa
| Yes | No | |
|---|---|---|
| Extends below foramen magnum | ||
| PFA-2c | 0 (0%) | 5 (100%) |
| PFA-2a and PFA-2b | 29 (87.9%) | 4 (12.1%) |
| All other PFA tumors | 96 (88.9%) | 12 (11.1%) |
| Encases blood vessels | ||
| PFA-2c | 0 (0%) | 5 (100%) |
| PFA-2a and PFA-2b | 17 (51.5%) | 16 (48.5%) |
| All other PFA tumors | 50 (46.3%) | 58 (53.7%) |
| Involves foramina of Luschka | ||
| PFA-2c | 2 (40%) | 3 (60%) |
| PFA-2a and PFA-2b | 31 (93.9%) | 2 (6.1%) |
| All other PFA tumors | 92 (85.2%) | 16 (14.8%) |
↵a Ninety-eight subjects had subtype data available. “All other PFA tumors” includes the PFA-1 subgroup and the PFA-2a and 2b subtypes. The 15 subjects with PFA-1 subgroup ependymomas that could not be subtyped were included in the category of All other PFA tumors. The 8 patients with PFA-2 tumors that could not be subtyped were not included in this analysis.