Fig. 4 | Modern Pathology

Fig. 4

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

Fig. 4

Epithelioid fibrous histiocytoma. a The polypoid tumor has an epidermal collarette. b Sharp circumscription is characteristic of this tumor type. c The epithelioid tumor cells contain abundant eosinophilic cytoplasm and show a vaguely whorled architecture. d Strong staining for ALK reflects the presence of an underlying ALK gene rearrangement in this tumor type

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