title: Annular hemosiderotic histiocytoma.
abstract: A 35-year-old woman was examined because of a symptomless multiple annular eruption. The lesion consisted of rings of closely set, smooth, firm papules that were brown in color. Hemosiderotic histiocytoma was diagnosed by light and electron microscopy. Ultrastructurally, the lesion consisted of fibroblastic and histiocytic cells with marked hemosiderin and lipid deposition.
mesh_terms: D000328:Adult; D001706:Biopsy; D005260:Female; D006486:Hemosiderosis / Q000473:pathology*; D018219:Histiocytoma, Benign Fibrous / Q000473:pathology*; D006801:Humans; D008854:Microscopy, Electron; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000473:pathology*