Caption |
Mammary gland: the mammary gland is effaced by a large, nodular, encapsulated, and moderately cellular neoplasm. The neoplasm is composed of interconnected branching ducts embedded is a large amount of a fibrovascular stroma characterized with interstitial edema, deposition of numerous and thick wavy collagen fibers, and the presence of numerous spindloid cells consistent with myofibroblasts. Neoplastic glands are lined by a two cells-thick epithelium: cells of the basal layer resemble myoepithelial cells of the mammary gland while cells of the luminal layer resemble luminal cells of the mammary gland. Neoplastic luminal cells often contain lipid vacuoles of various sizes. |