DOI: 10.36347/sasjs

Pages: 144-146

Fibromatosis is a rare entity and is even more unusual when found in the breast. Fibromatosis arising from the breast also referred to as desmoid tumor or aggressive fibromatosis of breast is a rare benign lesion posing clinical and radiological dilemma with various differential diagnosis, but histological examination can aid in confirming the diagnosis. This is a mesenchymal tumor with intermediate biological behaviour between the benign fibroblastic lesions and the low grade fibrosarcoma, characterized histologically by spindle cell proliferations composed of interlacing fibroblastic bundles and fascicles with varying degrees of collagen. We present this case of mammary fibromatosis in a 17-year-old girl who presented with a palpable mass within the medial portion of her left breast.