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.
Updated April 12, 2017. A count noun is a noun that refers to an object or idea that can form a plural or occur in a noun phrase with an indefinite article or with numerals. Contrast with mass noun (or noncount noun). Most common nouns in English are countable--that is, they have both singular and plural forms.