Compared to epithelial lesions, spindle-cell lesions of the breast are relatively uncommon and, because of that, may cause diagnostic difficulty. The majority of these spindle cell lesions, such as fibromatosis, nodular fasciitis, spindlecell carcinoma, inflammatory myofibroblatic tumor and angiosarcoma, resemble their more common non-mammary counterparts. A few others, such as pseudoangiomatou...
