General features comparing basal cell carcinoma with trichoblastoma
| Feature | BCC | TB |
|---|---|---|
| BCC, basal cell carcinoma; TB, trichoblastoma. | ||
| Age | Older | Younger |
| Site | Sun-exposed areas | Not limited to sun-exposed areas |
| Location | Usually limited to within dermis | Usually within deep dermis and subcutaneous fat |
| Peripheral palisading | Present | Present |
| Artefactual clefting | Present | Absent/inconspicuous |
| Keratin cysts | Usually absent | Usually present (small) |
| Mitotic activity | Present | Brisk |
| Stroma | Sclerotic and “normal”in amount | Sclerotic and “minimal” in amount |
| Calcification | Present | Present |
| Follicular papillae | Uncommonly seen | Usually present |