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Carcinoma in situ

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• Carcinoma in situ, squamous cell

  Carcinoma in situ, squamous cell: An early stage of skin cancer that develops from squamous cells (the flat, scale-like cells in the outer layer of the skin). The hallmark is a persistent, progressive, slightly raised, red, scaly, or crusted plaque that may occur anywhere on the skin surface or on mucosal surfaces, such as in […]

• Carcinoma of the breast, infiltrating ductal

  Carcinoma of the breast, infiltrating ductal: One of several recognized specific patterns of cancer of the breast, so named because it begins in the cells that form the ducts of the breast. It is the most common form of breast cancer. On a mammogram, invasive ductal carcinoma is usually visualized as a mass with fine […]

• Carcinoma of the breast, infiltrating lobular

  Carcinoma of the breast, infiltrating lobular: The second most common type of invasive breast cancer. Infiltrating lobular carcinoma starts in the glands that secrete milk (lobules). On a mammogram, a lobular carcinoma can look similar to a ductal carcinoma, appearing as a mass with fine spikes radiating from the edges (spiculation). Infiltrating lobular carcinoma can […]

• Carcinoma, ampullary

  Carcinoma, ampullary: Cancer of a structure called the ampulla of Vater, a small muscle located at the junction where the common bile duct (carrying bile from the liver and secretions from the pancreas) empties into the duodenum (upper small intestine). Because of its location, this cancer can cause obstruction of the common bile duct and […]

• Carcinoma, basal cell

  Carcinoma, basal cell: The most common type of skin cancer, a disease in which the cancer cells resemble the basal cells of the epidermis, the outer layer of the skin. Basal cell carcinomas usually appear as the classic “sore that doesn’t heal.” A bleeding or scabbing sore that seems to get somewhat better, then recurs […]

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