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, one place, or one thing. A possessive noun is a word that indicates that somethinâ¦g belongs to that person, place, or thing. A possessive singular noun is a singular noun that indicates that something belongs to that noun. EXAMPLES The doctor's office is on the second floor.