| renal portal system | An arterial portal system, in which efferent glomerular arterioles receive blood from the capillaries of the renal glomeruli and carry it to the peritubular capillary plexus surrounding the proximal and distal convoluted tubules. Synonym: hypothalamohypophysial portal system. (05 Mar 2000) |
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| renal pyramid | One of a number of pyramidal masses seen on longitudinal section of the kidney; collectively, they constitute the renal medulla, and contain part of the secreting tubules and the collecting tubules. Synonym: pyramis renalis, malpighian pyramid, medullary pyramid. (05 Mar 2000) |
| renal reflex | Anuria caused by injury to a remote part of the body or by disease or injury to one kidney or ureter. (05 Mar 2000) |
| renal replacement therapy | Procedures which temporarily or permanently remedy insufficient cleansing of body fluids by the kidneys. (12 Dec 1998) |
| renal retinopathy | Hypertensive retinopathy associated with chronic glomerulonephritis or nephrosclerosis. (05 Mar 2000) |
| renal segments | Regions of the kidney supplied by end arteries branching from the renal arteries; they are named anterior inferior segmentum, anterius superior segmentum, inferior segmentum, posterior segmentum, and superior segmentum. Synonym: segmenta renalia, arterial segments of kidney. (05 Mar 2000) |
| renal sinus | The cavity of the kidney, containing the calyces and pelvis of the ureter and the segmental vesels embedded within a fatty matrix. The renal sinuses cause the kidneys to appear hollow or C-shaped on cross section or medical imaging. Synonym: sinus renalis. (05 Mar 2000) |
| renal-splanchnic steal | Diversion of blood from the right renal artery via the inferior adrenal branch into splanchnic collaterals distal to a stenosis of the coeliac axis. (05 Mar 2000) |
| renal-splenic venous shunt | Anastomosis of the splenic vein to the left renal vein, usually end-to-side, for control of portal hypertension. Synonym: renal-splenic venous shunt. (05 Mar 2000) |
| renal surface of spleen | The surface of the spleen in contact with the left kidney. Synonym: facies renalis lienis, facies renalis splenis. (05 Mar 2000) |
| renal surface of suprarenal gland | Surface of suprarenal gland in contact with the kidney. (05 Mar 2000) |
| renal surface of the suprarenal gland | The surface of the suprarenal gland in contact with the kidney. Synonym: renal surface of the suprarenal gland. (05 Mar 2000) |
| renal tb | <radiology> Putty kidney: caseous necrosis with calcium deposition, Cf: medullary nephrocalcinosis, renal calcification, haematogenous origin, clinically unilateral in 75%, findings: papillary necrosis, infundibular stenosis, autonephrectomy, CXR abnormal in 50% (12 Dec 1998) |
| renal threshold | Concentration of plasma substance above which the substance appears in the urine. (05 Mar 2000) |
| renal transplantation | Transplantation of a kidney from a compatible donor to restore kidney function in a recipient suffering from renal failure. (05 Mar 2000) |