Atypical (“pseudosarcomatous”) cutaneous histiocytoma

We report a patient with a cytologically atypical hemiosiderotic 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.

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