TABLE 1.
Archival diagnoses and reclassification after pathologist panel review
| Archival diagnosis | ||||
|---|---|---|---|---|
| Reclassified diagnosis | Oligodendroglioma n = 39 | Astrocytoma n = 31 | Mixed glioma n = 8 | Gliomatosis cerebri n = 7 |
| Low‐grade oligodendroglioma | 2 | 2 | 1 | |
| High‐grade oligodendroglioma | 8 | 3 | ||
| Low‐grade astrocytoma | 1 c | 2 | ||
| High‐grade astrocytoma | 1 | 1 | 1 | |
| High‐grade undefined glioma | 1 | |||
| Oligodendroglioma not otherwise specified a | 1 | |||
| Glioma not otherwise specified b | 3 | 1 | ||
| Histiocytic sarcoma | 2 | |||
| Tumour not otherwise specified | 1 | |||
| Inflammatory lesion | 1 | 1 | ||
| Meningioangiomatosis | 1 | |||
| No tumour in section | 1 | 2 | ||
| Reclassification total | 3 (8%) | 19 (61%) | 8 (100%) | 7 (100%) |
a
Three of five pathologists agreed on a subtype of oligodendroglioma, but consensus was not reached on grade.
b
At least three of five pathologists diagnosed the case as some subtype of glioma, but consensus was not achieved on subtype or grade.
c
Archival diagnosis of glioblastoma (analagous to high‐grade astrocytoma) was reclassified to low‐grade astrocytoma.