Epithelial tumors
From the epithelium (including the coverage and glandular epithelium) occurred in the most common tumors, malignant epithelial tissue tumor (cancer) of the greatest crimes against humanity, the human body from the majority of malignant epithelial tissue.

First, benign epithelial tissue tumors

1. Papilloma (papilloma) covered by the epithelium occurred to the surface was exogenous growth, the formation of many of the papillary or finger-like protrusions, and showed villous or cauliflower-like appearance. The roots of the tumors often become more narrow pedicle connected with the normal tissue. Under each nipple by a branch of the blood vessel-like connective tissue stroma constitutes its axis, which covers the surface of epithelial hyperplasia as a result of the origin of the site varies, for squamous cell (Figure 7-9), transitional or columnar epithelium Epithelium. In the external ear canal, the stem and stop the colon and bladder papilloma more prone to the formation of papillary carcinoma and malignant transformation, it is worth noting.



Figure 7-9 skin papilloma

2. Adenoma (adenoma) is benign glandular occurred, was particularly prevalent in the thyroid, ovarian, breast, salivary gland and intestines, etc.. The mucous glands mostly polypoid adenomas (Figure 7-10), an organ inside the gland adenoma is mostly nodular, and often coated with clear boundaries around the normal tissue. Gland adenoma of the gland and its origin is not only structurally very similar, and often has a secretion. This is different from just outside the gland is the size of the adenoma, the more irregular shape, and more densely arranged. There are lobular occurred at catheter structures and organs of the adenoma, the lobular structures are often absent or not obvious, there is no catheter to form, it can not be discharged secretions.



Figure 7-10 intestinal adenoma polyps model

According to the adenoma of the characteristics of shape or composition, can be divided into cystadenoma, fibroadenoma, pleomorphic adenoma-like polyps and adenomas, and other types.

(1) cystadenoma (cystadenoma): adenoma tissue as a result of siltation secretion glands, glandular cavity to expand and gradually integrating into a capsule, the naked eye can see on the size of the cysts, which got its name. Cystadenoma often occur in ovarian, pancreatic and thyroid in occasionally. Ovarian cystadenoma There are two main types: one for the glandular intracavitary was papillary growth and serous secretion, so called serous papillary adenoma (serous papillary cystadenoma); another mucus secretion, often For more room, more smooth wall, a rare papillary hyperplasia, known as mucinous (mucinous cystadenoma) (Figure 7-11). Serous papillary cystadenoma more prone to malignant transformation, into a serous cystadenocarcinoma (serous cystadenocarcinoma).



Figure 7-11 ovarian mucinous

Atrial tumors were more cystic, cysts containing mucus

(2) fibroadenoma (fibroadenoma): In addition to the epithelial cells to form gland, yet at the same time accompanied by a large number of connective tissue fibers hyperplasia, together constitute the essence of tumor. The female breast tumors common benign tumor.

(3) pleomorphic adenoma (pleomorphic adenoma) by the gland, mucus-like tissue and cartilage and other components of the mixed composition. Often occur in the salivary gland, in particular, commonly found in the parotid gland, in the past referred to by mixed tumor. At present, is generally believed that the parotid gland tumor by Run-control and myoepithelial cell of a tumor occurs. As the spread of myoepithelial cells may arise between the mucus-like matrix and cartilage-like tissue for chemical and biological weapons, which pose more of the characteristics of shape. The slow-growing tumor, but after the removal of more easily relapse.

(4) polypoid adenomas (polypous adenoma) took place in the mucosa, were polypoid, Beattie linked with the mucous membrane, found in the rectum (Figure 7-10), which was on the surface papillary or malignant villous were higher. The tumor is also found in the colon, stomach, etc., adenomatous polyposis colon multiple family often hereditary, not only the high rate of cancer, and easily took place early cancer.

Second, the malignant epithelial tissue tumors

By epithelial cancers occur malignancy called, was particularly prevalent in the elderly, the most common humanity is a class of malignant tumors. Cancer often invasive growth-oriented, it is unclear boundaries and surrounding tissue. Took place in the skin, mucous membrane on the surface of cancer on the appearance of Chang Cheng-like polyps, or cauliflower-like mushroom umbrella, often on the surface to form ulcers and necrosis; occurred in the organs of the often irregular nodular, or crab-like roots were Foot-infiltration to the surrounding tissue, hard texture, often off-white section, drier. Microscope, cancer cells can be shaped gland was, nested or cord-like arrangement, with a clear dividing line between quality. Also in the interstitial infiltration was diffuse growth, with clear boundaries between quality. Fiber mesh cells stain see no more than between the fiber network, and only in the cancer around the nest. Cancer at an early stage and more generally by the lymphatic metastasis to occur until late blood metastasis.