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The Korean Journal of Pathology 2000;34(1): 96-98.
Myofibrosarcoma of the Breast: A case report .
Chan Kwon Jung, Kyo Young Lee, Chang Suk Kang, Sang In Shim, Byung Kee Kim
Department of Clinical Pathology, College of Medicine, The Catholic University of Korea, Seoul 150-713, Korea.
Myofibrosarcoma of the breast is a rare malignant mesenchymal tumor that has been reported in only four well documented cases so far. We report a case of myofibrosarcoma of the breast in an 88-year-old man who complained of a palpable mass for 1 year. Microscopically, the tumor consisted mainly of spindled cells, arranged in irregular fascicles and embedded in broad bands of dense hyalinized collagen. It showed ill-defined border infiltrating the adjacent adipose tissue, moderate cellular pleomorphism, and high mitotic rate (8~9/10 HPF). Immunohistochemical study confirmed myofibroblastic differentiation of the tumor cells with diffuse strong reaction for vimentin, smooth muscle actin, and fibronectin.
Key Words: Myofibrosarcoma; Breast