Medallion-like dermal dendrocyte hamartoma: A rare congenital CD34-positive dermal lesion clinically and pathologically overlapping with fibroblastic connective tissue nevus.

Both medallion-like dermal dendrocyte hamartoma and fibroblastic connective tissue nevus are rare benign dermal lesions composed of CD34-positive spindle cells. Although regarded as different diseases, it is sometimes difficult to distinguish between them due to their clinical and pathological similarities. We present a case of medallion-like dermal dendrocyte hamartoma that could also be diagnosed as fibroblastic connective tissue nevus and propose the possibility of overlap in these diseases.