The image displays the rectum with a ulcerated polypoide like “flask shaped” and several tiny ulcers (aphtas). Entamoeba histolytica Mature cysts are ingested via contaminated water or food. After excystation in the small intestine, trophozoites inhabit the large intestine and can either invade the tissue (pathogenic amebas) or are eliminated in the stools. Trophozoites do not survive outside the body. This parasite was named for its remarkable ability to lyse human tissues. A prerequisite to amebic invasion is the parasite's ability to colonize and penetrate colonic mucins overlying the intestinal epithelium.
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