Figure 3From: Malignant fibrous histiocytoma of the distal femur after an arthroscopic anterior cruciate ligament reconstruction: A case report and a review of the literature (a) shows the tumor biopsy with CD68 positive histiocytes (black arrows, 200-fold magnification), (b) shows the histological picture of a cell-rich mesenchymal tumor with storiform growth pattern, marked polymorphism, high rate of mitosis (black arrows) and marked angioneogenesis (*); HE, 200-fold magnification. (c) demonstrates the clear sm actin immunoreactivity (black arrow) of the tumor cells; anti-sm actin, 100-fold magnification.Back to article page