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    Embryology, Anatomy and Physiology of the Colon, Rectum and Anus. Colonoscopy of the Anus, Rectum and Normal Colon. Neoplasia of the Colon and Rectum. Inflammatory Colitides. Anorectal and Colonic Dysmotility. Diseases of the Anus. Lower Gastrointestinal Bleeding. Colon and Rectal Surgery. Colonic Diverticulosis. Radiologic Images. Pathology of the Colon and Rectum
    Anus
    Diverticulosis
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    The rectum and anus chapter explains diseases and conditions of the rectum and anus. The diseases of the rectum and anus are explored with the common presenting symptoms identified. The occurrence rates of these conditions are defined and any potential causes listed. The investigations that are required to diagnose the conditions are described. Treatment options or preventative measures are also explained with identification of any potential complications. There are many conditions that can affect the rectum and anus including rectal prolapse, haemorrhoids, pilonidal sinus, and rectocele. Other conditions include anorectal abscess, anal fistula, anal warts, and anal fissure. Succinct descriptions of caring for people with diseases and conditions of the rectum can increase the knowledge of the nurse.
    Anus
    Rectal fistula
    Anything that can happen in the rest of the digestive system can happen in the rectum and anus, with inflammatory disease and cancer being examples of diseases that are both common to the digestive tract, yet have unique properties when they occur in the rectum or anus. This anatomic area is also susceptible to diseases that family practitioners routinely deal with in the generic sense, such as trauma, abscesses, cysts, dermatologic lesions, bacterial and viral diseases, and the social implications of sexually transmitted diseases.
    Anus
    Digestive tract
    ? Objective To explore the rational extent resected in operation for low level rectum cancer to decrease the recurrence rate.Methods Of 147 cases of low rectum cancer including 99 cases were reserved anus and 68 cases underwent Mile′s operation. Results The 3 year survival rate was 72.1%(93 cases)and the 5 year survival rate was 63.4%(71 cases).The recurrence rate was 28.9%(42 cases),which was related to the pathological types and Duke′s stage, not to the operation method.Conclusions The low rectum cancer of Duke′s B or Duke′s C,which presents high malignance, should undergo extended radical operation.Those the distance of lower edge to the dentate line is more than 3~4cm should reserve anus as much as possible and the extended radical operation is key to reducing its recurrence rate. 〔
    Anus
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    Postoprative pain of anus and rectum,a common and difficult kind of complaint in anus and rectum diseases,which bringing great pressure and suffering to patients,not only can delay the healing of wound and the recovery of function of anus and rectum,but cut down the quality of life.Then the author try to get a better method from medical data of recent ten years to receive the Postoprative pain of anus and rectum.
    Anus
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    Objective To analyze surgical indications and methods for keeping anus operation in treating patients with middle-lower segment rectum cancer.Methods Retrospective analysis on clinical data of 23 cases with middle-lower segment rectum cancer treated by keeping anus operation between January 2002 and March 2007 had been carried out.Results There were no death, complications and recurrence after the operation seen in follow-up study.Conclusion The indications for keeping anus operation in treating patients with middle-lower segment rectum cancer are as follows: the distance from tumor to anus≥5cm, the diameter of tumor ≤3 cm, the range of rectum involved by the tumor ≤1/2, no infiltration of tumor cells in the serosae of intestinal wall and peripheral tissues or organs, and carcinomatous change of polypoid adenoma. The surgical methods for this operation are total mesorectal excision and cleaning up neighboring lymph nodes.
    Anus
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