Causes. Retroperitoneal fibrosis occurs when extra fibrous tissue forms in the area behind the stomach and intestines. The tissue forms a mass (or masses) that can block the tubes that carry urine from the kidney to the bladder.
noun /naÊn/ n a word or group of words that refers to a person, place, or thing or any syntactically similar word (as modifier): a noun phraseAbbreviation: N, n Related adjective(s): nominal Etymology: 14th Century: via Anglo-French from Latin nÅmen name. Ënounal adj.
noun-the word class that can serve as the subject or object of a verb, the object of a preposition, or in apposition. collective noun-a noun that is singular in form but refers to a group of people or things. mass noun-a noun that does not form plurals. count noun-a noun that forms plurals. generic noun-a noun that does not specify either masculine or feminine gender.