Intradermal melanocytic nevus with prominent schwannian differentiation.
Features of peripheral nerve sheath differentiation such as neuroid cords, nerve corpuscles, fascicle-like structures, and, exceptionally, palisading have been reported in melanocytic nevi. We report an intradermal melanocytic nevus with prominent Verocay-like bodies. The upper portion of the neoplasm was composed of typical round intradermal nevus cells, many of which were pigmented. Within the deeper portion, there was a nonpigmented spindle cell proliferation with prominent Verocay bodies, simulating a neurilemmoma. Typical nevus nests merged with neurilemmoma-like areas. The entire lesion stained positively for S-100 and Mart-1 proteins and negatively for HMB-45 stain. Diffuse Mart-1 positivity excluded a collision of a melanocytic lesion with a neurilemmoma. The histopathologic features of this nevus further support a close relation between nevus cells and Schwann cells.
Kroumpouzos
George
G
Department of Dermatology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
Cohen
Lisa M
LM
D000328:Adult; D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor / Q000032:analysis; D006801:Humans; D007124:Immunoenzyme Techniques; D002479:Inclusion Bodies; D058965:MART-1 Antigen; D008297:Male; D009363:Neoplasm Proteins / Q000032:analysis; D009508:Nevus, Pigmented / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D009418:S100 Proteins / Q000032:analysis; D012583:Schwann Cells / Q000737:chemistry / Q000473:pathology*; D012878:Skin Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery
D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D058965:MART-1 Antigen; C548667:MLANA protein, human; D009363:Neoplasm Proteins; D009418:S100 Proteins