renal sinus
noun
: the main cavity of the kidney that is an expansion behind the hilum and contains the renal pelvis, calyxes, and the major renal vessels
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“Renal sinus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/renal%20sinus. Accessed 21 Dec. 2024.
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