Histological types of cancer
What is Carcinoma?
Carcinoma refers to a malignant epithelial neoplasm or cancer of the body’s inner or outer lining. Carcinomas, epithelial tissue malignancies, account for 80 to 90 percent of all cancer cases.
Epithelial tissue can be found all over the body. It is found in the skin, as well as organs and internal passageways, such as the gastrointestinal tract, covering and padding.
Carcinomas are classified into two primary subtypes: adenocarcinoma that occurs in an organ or gland, and squamous cell carcinoma that originates from the squamous epithelium.
Adenocarcinomas usually occur in mucus membranes and are often seen as a thickened white plaque-like mucosa. Sometimes they quickly spread across the soft tissue where they occur. In many parts of the body, squamous cell carcinomas occur.
Most carcinomas involve organs or glands that can secrete, such as breasts that produce milk, or lungs that secrete mucus, or colon or prostate or bladder.