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 phrase. n. 1. (Grammar) grammar a constituent of a sentence that consists of a noun and any modifiers it may have a noun clause, or a word, such as a pronoun, that takes the place of a noun.Abbreviation: NP.. (Grammar) grammar a constituent of a sentence that consists of a noun and any modifiers it may have a noun clause, or a word, such as a pronoun, that takes the place of a noun.