It is the malignancy digestive more frequent in western countries, its incidence is highest in North America and Australia, somewhat lower in western Europe, lowest rates are recorded in South America, Asia and Africa.
The colorectal carcinoma is more prevalent in the urban population, in males of whites, the multiparity exerts a protective effect on women, although the tumors of location hayloft right, are more frequent in women, the incidence of colorectal carcinoma increases rapidly from the 40 years, peaking between 60 and 80 years.
- Poliposis Colonica con Adenocarcinoma Ulcerovegetante Rectal
The geographical difference in the incidence, seems attributable to the diet, deficit the fibers, excesses in the consumption of unsaturated fats, cholesterol and refined sugars, in a body with susceptibility genetically determined to develop injuries polypoid adenomatosas single or multiple, according to epidemiological evidence, clinics, morphological, genetic and molecular the point as precursors of the most colorectal carcinomas and on them can develop the alteration precancerous histological, called dysplasia, whose progression leads to a transformation tumor malignant.
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The cancer of the cervix not develops suddenly, their development for years, starting generally at the level of the lining scaly, these normal cells, in some patients probably by deficits in their defenses or local immunity, together with other co-factors (tobacco, hormonal factors, infections and herpesvirus virus such, etc. ) to the aggression of a factor carcinogenic already tested as is the infection by the virus HPV (human papilloma virus) Contracted through sexual intercourse, with a higher incidence among the 20 and 40 years, virus for which there to the date more than a hundred varieties or subtypes, remain predominantly the category of “high risk” (HPV 16, 18, 45, 56) which have been found in a high percentage in precancerous lesions, squamous cell carcinoma in situ, squamous cell carcinoma, infiltrating adenocarcinoma of the cervix and their propagation outside the body (metastasis).
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Cuello Uterino Normal
It is the bottom and close the uterus that connects the body of the uterus with the vagina..
The uterus or matrix is a hollow organ, in the form of pear, aimed at preserving and nurture the product of conception (embryo – fetus) and to expel at the time, located on the part but lower abdomen of women (pelvis) between the bladder or rectum.
The cervix form a channel (endocervical canal) that leads into the vagina, which leads to the outside of the body.
The cervix, for the most extension, is covered by a epithelium cells flat, which are stratified as flakes, hence its name squamous epithelium, which continues in vagina and is the first image that has the gynecologist by placing the speculate intravaginal.
This portion of the cervix neighbor to vagina is called ectocervix or exocervix. The internal part, the cervix is called endocervix, which is the importance of a through so-called through endocervical. The endocervix this consists of a cylindrical epithelium columnar, with glands that produce clear mucus filante (mucus pre-ovulatory).
The union or “shock” of both epithelia (squamous epithelium ectocervical and columnar endocervical glandular) is called union escamo-columnar or processing area, located generally at the level of external hole of the cervix, being the place where originates 95 % of the cancers of the cervix.
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The cancer refers to a group of more than 200 different diseases, all of them affecting the basic unit of the body THE CELL, normally cells divide to produce more cells, only when the agency needs, in the form of an orderly process and regulated that helps keep us healthy.
When the cells keep dividing when not needed, they generate a mass of tissue called TUMOR, which can be benign or malignant.
Fibroadenoma Mamario
The bening tumors are are not cancerous, not infiltrate to other tissues, nor does it spread to other parts of the body (metastasis), it is generally defined either of the adjacent structures can operate (dry) and not reappear (recurrences).
The benign tumors are not a threat to life.
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