HIGHLIGHTS
SUMMARY
Mammary myofibroblastoma (MFB) is a benign mesenchymal tumor composed of fibroblasts and myofibroblasts and a variable number of adipocytes that was first described in 1987 by Wargotz et_al. Fine needle aspiration cytology was negative for malignancy, and biopsy revealed a spindle cell lesion without significant atypia or mitotic activity that was immunohistochemically positive for Vimentin and CD34 and negative for CKAE1/AE3, CK8/18, and P63. The descriptive diagnosis was "spindle cell lesion lacking atypia or mitoses possibly benign, but a low malignant potential lesion cannot be excluded." On microscopic examination, the tumor consisted . . .
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