The condition of a 68-year-old woman with Mucha-Habermann disease had been erroneously diagnosed as reticulum cell sarcoma on the basis of skin biopsies. Results of touch imprint smears of skin biopsies were helpful in establishing the benignity of the disorder. Vascular inflammation that resembled allergic vasculitis was seen in the mid-dermis, as were the more characteristic findings of superficial lymphocytic vasculitis and epidermal changes usually described in Mucha-Habermann disease.
Muller SA, Schulze TW. Mucha-Habermann Disease Mistaken for Reticulum Cell Sarcoma. Arch Dermatol. 1971;103(4):423-427. doi:10.1001/archderm.1971.04000160073011