abnormal kidney collecting duct morphology abnormal kidney collecting duct number 2012-11-30T03:43:16Z MP:0011845 MPheno.ontology anomaly in the number of any of the kidney ducts that collect urine from the distal convoluted tubules, merge and become larger as they descend from the renal cortex into the medulla, and respond to vasopressin and aldosterone to regulate water, electrolyte and acid-base balance csmith