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.
A noun is a word for a person, a place, or a thing.    A singular noun is a word for one person, place,  or thing.    Examples:    my mother, a neighbor, â¦the teacher  a city, a country, a resort  my house, a cookie, the car   (MORE) Notyouraveragedummy ...