[Histiocytic sarcoma from phagocyting histiocytes].

Histiocytic sarcoma consisting of phagocyting histiocytes is a rare variant of histiocytic sarcoma. It is hard to detect because of its similarity with large cell lymphomas, in particular with anaplastic large cell lymphoma. Histological and immunohistochemical findings are presented. Differential diagnosis with tumours of hematopoietic and non-hematopoietic nature is described.