What is carcinoma?

Carcinoma is a malignant cellular tumor which tends to invade surrounding tissues and/or spread to other parts of the body by metastasis, causing eventual death.
alveolar cell c. See bronchiolar carcinoma.
basal cell c. A malignant tumor derived from the basal layer of the skin or from structures derived from basal cells; it invades locally but rarely metastasizes and occurs most frequently on the face and scalp.
bronchiolar c. A rare type of carcinoma derived either from the lining cells of the pulmonary alveoli or from the terminal bronchioles.
bronchogenic c. Carcinoma arising from a bronchus; the most common form of carcinoma of the lung.
colloid c. See mucinous carcinoma.
embryonal c. of testis A highly malignant neoplasm of the testis appearing as a small grayish white nodule or mass, sometimes associated with hemorrhage and necrosis.
epidermoid c. See squamous cell carcinoma.
c. in situ Carcinoma that is still confined to its site of origin, before it spreads to other tissues.
intraductal c. Carcinoma derived from epithelial cells of a duct, especially in the breast.
medullary c. A soft, fleshy, usually large tumor consisting chiefly of epithelial cells
with little fibrous stroma.
mucinous c. A form of adenocarcinoma in which the degenerative process results in the formation of several areas of mucinous or hyaline material.
oat cell c. A small-celled carcinoma usually occurring in a bronchus.
papillary c. A finger-shaped carcinoma.
primary c. Carcinoma at the site of origin.
scirrhous c. A stony-hard tumor having a great amount of fibrous tissue, usually occurring in the breast.
signet-ring cell c. A tumor composed of cells with a droplet of mucus in the cytoplasm, which compresses the nucleus against the cell membrane.
small cell c. See oat cell carcinoma.
spindle cell c. Carcinoma composed of elongated cells; may resemble a sarcoma.
squamous cell c. Carcinoma derived from epithelium, often from normal
epithelium, probably made susceptible by a variety of factors.
transitional c. Carcinoma derived from transitional epithelium; usually occurring in the bladder, ureters, renal pelves, and nasopharynx.
villous c. Carcinoma composed of frondlike projections covered with neoplastic

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