title: Atypical ("pseudosarcomatous") cutaneous histiocytoma.
abstract: We report a patient with a cytologically atypical hemosiderotic histiocytoma that histologically suggested a sarcoma. The lesion is differentiated from atypical fibroxanthoma and fibroxanthosarcoma. We wish to emphasize the benign nature of this variant of histiocytoma whose extreme cellular atypicality may simulate a sarcoma.
mesh_terms: D046508:Culture Techniques; D003937:Diagnosis, Differential; D005260:Female; D005350:Fibroma / Q000473:pathology*; D005354:Fibrosarcoma / Q000473:pathology*; D018219:Histiocytoma, Benign Fibrous / Q000473:pathology*; D006801:Humans; D008875:Middle Aged; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000473:pathology*