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The Korean Journal of Pathology 1987;21(1): 49-53.
Leiomyosarcoma of the Breast.
In Sook Lim, Dong Soo Suk
Department of Pathology, Inje Medical College, Pusan, Korea.
ABSTRACT
Leiomyosarcoma of the breast is extremely rare. The natural history of leiomyosarcoma of the breast remains largely unknown because of the low incidence and lack of long-term follow up. But leiomyosarcoma of the breast appears to be less aggressive biologically than other sarcomas of the breast such as rhabdomyosarcoma. In an attempt to define diagnostic criteria of smooth muscle tumors of the breast, the reported cases of leiomyoma of the breast and nipple were also reviewed and compared with leiomyosarcomas by Chen et al(1981). Based on the result of this review, tumors with three or more mitoses per 10 HPF are leiomyosarcoma and those with no mitosis, necrosis, and significant atypia are leiomyomas. We have experienced a case of leiomyosarcoma of the breast. The patient was a 39 year-old female and was admitted due to a rapid growing right breast mass. The breast mass was noted 4 years ago and then this year the mass growed rapidly. Simple mastectomy was performed. Grossly the mass measured 11.0x8.0x8.0 cm in dimensions and was well circumscribed, pinkish, multinodular, and it was protruded from the cut surface. Microscopically the mass is composed of interlacing bundles of spindle shaped cells and multifocal large areas of hyalinized collagenous tissue. The individual spindle cells are slightly pleomorphic and occasionally show mitotic figures, 6~7 per 10 HPF in the most cellular area.
Key Words: Leiomyosarcoma; Breast
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