renal sinus
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http://purl.obolibrary.org/obo/UBERON_0006171
A hollowed out area on the medial margin of the kidney. The renal sinus opens at the renal hilum; it contains the renal aa. and vv., major calyces and renal pelvis, perirenal fat [ http://anatomy.uams.edu/anatomyhtml/kidney.html ]