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polyp (polĀ“ip)   any growth or mass protruding from a mucous membrane; it may be pedunculated (attached to the membrane by a thin stalk), or sessile (having a broad base). Polyps are usually an overgrowth of normal tissue, but sometimes they are true tumors, masses of new tissue separate from the supporting membrane. Usually benign, they may lead to complications or eventually become malignant. They can occur wherever there is mucous membrane, such as in the nose, ears, mouth, lungs, heart, stomach, intestines, urinary bladder, uterus, or cervix.




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