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Retroperitoneal fibrosis

progressive condition characterized by deposition of fibrous tissue in the retroperitoneal space

Pronunciation
/ˌrɛtrəʊˌpɛrɪtəˈnɪəl fʌɪˈbrəʊsɪs/
/ˌrɛtroʊˌpɛrətnˈiəl faɪˈbroʊsəs/