PMC6282444_01
Dysplastic nevus with associated TIF. A 6-mm brown papule with a pink corner is present on the right upper back of this 69-year-old man with a history of melanoma and BCC.
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On examination, there was a 4-mm atypical brown macule on the left upper back (Fig 1).
Biopsy of a lesion. A, A dysplastic nevus with single melanocytic hyperplasia at the dermoepidermal junction is seen with an associated tumor of the follicular infundibulum. B, Platelike proliferation of anastomosing strands of pale staining cells consistent with a tumor of the follicular infundibulum. (A and B, Hematoxylin-eosin stain; original magnifications: A, x4; B, x20.)
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On pathologic examination, hematoxylin-eosin-stained sections showed an atypical lentiginous junctional nevus (dysplastic nevus) (Fig 2, A). TFI (Fig 2, B). The lesion was diagnosed as a dysplastic nevus associated with a tumor of the follicular infundibulum.