Table 5.
Microscopic features of this clinical series
| Microscopic characteristic | Number (n = 67) |
|---|---|
| Bosselated or lobulated | 51 |
| Multifocal | 9 |
| Cystic | 62 |
| Beading | 67 |
| Tubules | 67 |
| Luminal squamous ball/morule | 41 |
| Stromal sclerosis or collagen present | 42 |
| Myxoid stroma | 64 |
| Histiocytes | |
| Lipofucsin/hemosiderin laden, luminal location | 20 |
| Lipofucsin/hemosiderin laden, stromal location | 11 |
| Foamy, luminal and/or stromal location | 11 |
| Luminal hemorrhage | 51 |
| Microliths (calcifications; psammoma bodies) | 33 |
| Necrosis present | 0 |
| Mitotic figures | |
| Present (number of cases) | 24 |
| Mean (per 10 HPFs) | 0.5 |
| Range (per 10 HPFs) | 1–4 |
| Atypical figures identified | 0 |
| Other features | |
| Degenerated or infarcted | 3 |
| Tyrosine crystals | 1 |
| Oncocytic | 2 |
| Mucinous metaplasia | 1 |
| Surgical margin status | |
| Positive | 28 |
| Negative | 39 |
| Number of slides examined (mean) | 1.2 |
| Difference in features between surgical sample and TMA core | None |
HPF high power field, TMA tumor microarray