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Histologic examination showed multiple discrete cellular lobules within the dermis and subcutis. The lobules were composed of spindle-shaped cells with oval nuclei. Several of the lobules bulged into the lumens of dilated thin-walled vascular channels. No cellular atypia was seen.
The patient's hemoglobin concentration, platelet count, and coagulation findings were normal. A magnetic resonance imaging study showed no involvement beyond the skin. The patient remained under observation, attending the outpatient clinic for monitoring of symptoms, lesion size, and platelet count. He was observed for 12 months, and no change in lesion size or associated complications were noted.
An Erythematous Patch and Plaque on the Shoulder—Diagnosis. Arch Dermatol. 2008;144(9):1217–1222. doi:10.1001/archderm.144.9.1218-c
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