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renal pelvis n a funnel-shaped structure in each kidney that is formed at one end by the expanded upper portion of the ureter lying in the renal sinus and at the other end by the union of the calyxes of the kidney
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pelvis renalis [TA] the expanded upper end of the ureter into which the renal calices open, ordinarily lodged within the renal sinus. Under certain conditions a large part of it may be outside the kidney (see extrarenal p.).Medical dictionary. 2011.