obsolete_hydronephrosis true true Collection of urine in the renal pelvis that results in dilatation of the renal pelvis and calyces. It is caused by obstruction of urine flow, nephrolithiasis, or vesicoureteral reflux. Signs and symptoms include flank pain, nausea, vomiting, fever, and dysuria. ICD9:591 DOID:11111 MedDRA:10020524 3.88.0 MESH:D006869 NCIt:C26796 SNOMEDCT:43064006 Replaced by Mondo term MONDO_0005510, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0005510 Catherine Leroy http://purl.obolibrary.org/obo/MONDO_0005510