Fig. 3 | Modern Pathology

Fig. 3

From: Cutaneous soft tissue tumors: how do we make sense of fibrous and “fibrohistiocytic” tumors with confusing names and similar appearances?

Fig. 3

Atypical dermatofibroma. a Similar to other dermatofibroma variants, the tumor is relatively circumscribed and shows overlying epidermal hyperplasia. b The tumor shows a variably fascicular-to-storiform growth pattern. c Entrapment of hyaline dermal collagen is a helpful diagnostic clue. d The degree of nuclear atypia and pleomorphism can be striking. Without careful attention to the other histologic features, there is significant risk for misdiagnosis as sarcoma

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