Abstract: Hu Jin*, Fang Kai, Ma Donglai. *Department of Dermatology, Affiliated Hospital of Children, Capital Institute of Pediatrics, Beijing 100020, China Corresponding author: Ma Donglai, Email: mdonglai@sohu.com 【Abstract】 Three cases of medallion-like dermal dendrocyte hamartoma are reported. The patients included two men and one woman, and were aged from 2 to 38 years. All the patients presented with medallion-shaped, well-defined, slightly atrophic and asymptomatic congenital patches with prominently dilated superficial veins that had grown proportionately with the body length. Histological examination revealed similar changes in all of these patients, including epidermal atrophy and dermal proliferation of spindle cells, which stained positive for CD34, factor ?育a and vimentin, but negative for S100, CD68, CD1a, CD31 and smooth muscle actin （SMA）. None of the patients received special therapy, and the lesions enlarged slightly with body growth within 3 － 4 years of follow-up after the diagnosis.

Key words: Medallion-like dermal dendrocyte hamartoma, Pathologic process, Skin manifestations