| Diagnosis (memorize) | Description (memorize) |
|---|
| Intraductal carcinoma of the breast | Tumor cells fill ducts, tumor cell necrosis results in cheese-like consistency |
| Invasive ductal carcinoma | Most common type, characterized by tumor cells arranged in cords, islands, and glands embedded in a dense fibrous stroma; abundant fibrous tissue results in firm consistency |
| Paget disease of breast | Eczematoid lesion of the nipple or areola; neoplastic Paget cells, characteristic large cells surrounded by a clear halo-like area, invade the epidermis; underlying ductal carcinoma almost always present |
| Lobular carcinoma in situ | Clusters of neoplastic cells fill intralobular ductules and acini; may lead to invasive carcinoma many years later (in the same or contralateral breast); often bilateral at the time of diagnosis |
| Medullary carcinoma | Cellular with scant stroma; soft, fleshy consistency; characteristic lymphocytic infiltrate, prognosis better than that for invasive ductal carcinoma |
| Mucinous carcinoma | Pools of extracellular mucus surrounding clusters of tumor cells; gelatinous consistency; prognosis better than for invasive ductal carcinoma |
| Inflammatory carcinomas | Lymphatic involvement of skin by underlying carcinoma, causing red, swollen, hot skin resembling an inflammatory process; peau d'orange, poor prognosis |
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