Microscopic features of 54 cases of small sclerosing pneumocytoma with an intraoperative frozen diagnosis
| Growth pattern | Frozen section diagnosis | ||||
| Sclerosing pneumocytoma | Misdiagnosis | Deferral diagnosis | Overall | ||
| Malignancy | Others | ||||
| (N=34) | (N=3) | (N=3) | (N=14) | (N=54) | |
| More than two patterns | 5 (50%) | 0 (0.0%) | 0 (0.0%) | 5 (50.0%) | 10 (18.5%) |
| One dominant pattern | 44 (81.5%) | ||||
| Solid | 15 (62.5%) | 2 (8.3%) | 1 (4.2%) | 6 (25.0%) | 24 |
| Papillary | 8 (72.7%) | 1 (9.1%) | 0 (0.0%) | 2 (18.2%) | 11 |
| Sclerotic | 3 (60.0%) | 0 (0.0%) | 2 (40.0%) | 0 (0.0%) | 5 |
| Haemorrhagic | 3 (75.0%) | 0 (0.0%) | 0 (0.0%) | 1 (25.0%) | 4 |
The number and proportion of misdiagnosed cases in intraoperative diagnosis are indicated in bold.