Spindle cell carcinoma of the breast: case report and review.

Spindle cell carcinoma is a distinct, but unusual, variant of squamous cell carcinoma. It is seen most frequently in the upper aerodigestive tract and esophagus. The natural history seems to be similar to that of the more typical squamous cell carcinoma. A case of spindle cell carcinoma arising from the ductal epithelium of the breast is reported. The light and electron microscopic histology is described. A review of the literature suggests that this rare neoplasm should be managed in a fashion similar to that for more common types of epithelial breast duct malignancies.