The renal pelvis and renal calculi are not the same. The renal
pelvis is a normal part of the body. Renal calculi are kidney
stones and are not normal.
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The word is "renal." It refers to anything related to the kidneys, such as renal function, renal failure, or renal disease.
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They are located in the renal medulla and are made of a renal
corpuscle and a renal tubule.