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 definition, any member of a class of words that can function as the main or only elements of subjects of verbs (A dog just barked), or of objects of verbs or prepositions (to send money from home), and that in English can take plural forms and possessive endings (Three of his buddies want to borrow John's laptop).