الفهرس 
Embryology of the anal canal:
Anal fistula (Fistula in ano):Only 14 pages are availabe for public view
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Abstract
Anorectal diseases are a group of medical disorders that occur at the junction of the anal canal & the rectum and their prevalence in general population is probably much higher than that seen in clinical practice as most patients do not seek medical attention[1].Hemorrhoids, anal fissures, and fistulas are common benign anorectal diseases that have a significant impact on patient`s life[2].Hemorrhoidal disease is protrusion of plexus or blood vessels in the anal canal. The hemorrhoid may cause symptoms that are: bleeding, prolapse,itching, soilage of feces, and psychologic discomfort[3] An anal fissure is a linear tear in the anal mucosa, usually extending from the dentate line to the anal verge. If one persists for more than 4-8 weeks,it is considered chronic[4].