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Right kidney

The right kidney is one of the two retroperitoneal organs of the urinary system. It is typically located between the T12 and L3 vertebrae, slightly lower than the left kidney due to the presence of the liver superiorly. The right kidney is bean-shaped, with a convex lateral border and a concave medial border containing the renal hilum.

At the hilum, the renal vein lies most anterior, the renal artery is in the middle, and the renal pelvis lies posteriorly. The kidney is surrounded by the renal capsule, perirenal fat, renal fascia (Gerota’s fascia), and pararenal fat, which protect and stabilize it. Internally, it consists of the cortex, medulla (renal pyramids), renal columns, minor calyces, major calyces, and the renal pelvis, which drains into the ureter.

The right kidney lies posterior to the liver, right adrenal gland, duodenum (second part), and hepatic flexure of the colon. It is clinically important in conditions such as hydronephrosis, renal stones, tumors, infections, hypertension, and trauma.

Synonyms

  • Right renal organ

Function

  • Filters blood to remove waste products, producing urine

  • Regulates fluid and electrolyte balance

  • Maintains acid–base balance

  • Secretes hormones: erythropoietin (red blood cell production), renin (blood pressure regulation), and activates vitamin D

  • Plays a key role in homeostasis and blood pressure control

Nerve Supply

  • Derived from the renal plexus (sympathetic fibers from T10–L1, parasympathetic from vagus nerve)

  • Provides autonomic control of renal blood flow and renin release

Arterial Supply

  • Right renal artery, a lateral branch of the abdominal aorta, arising slightly lower than the left

  • Divides into segmental arteries → interlobar → arcuate → interlobular arteries

Venous Drainage

  • Right renal vein drains directly into the inferior vena cava (IVC)

  • Shorter than the left renal vein due to proximity to IVC

MRI Appearance

T1-weighted images:

  • Cortex: intermediate signal

  • Medulla: slightly hypointense relative to cortex

  • Renal sinus fat: bright hyperintense, outlining calyces and pelvis

T2-weighted images:

  • Cortex: intermediate-to-high signal

  • Medulla: lower signal than cortex

  • Urine in calyces/pelvis: bright hyperintense, excellent contrast with parenchyma

STIR:

  • Suppresses perirenal and sinus fat, making fluid, edema, or inflammation stand out as bright signals

  • Useful in detecting pyelonephritis, trauma, or perinephric collections

T1 Fat-Saturated (Pre-contrast):

  • Renal cortex shows intermediate signal, distinct from suppressed fat

  • Helps differentiate parenchyma from sinus fat and pathology

T1 Fat-Saturated Post-Contrast (Gadolinium):

  • Corticomedullary phase: cortex enhances brightly, medulla less so

  • Nephrographic phase: homogeneous enhancement of parenchyma

  • Excretory phase: contrast in calyces, pelvis, and ureter

  • Excellent for evaluating tumors, vascular lesions, scarring, and obstruction

MRI Non-Contrast 3D Imaging:

  • Allows 3D reconstruction of renal parenchyma, vessels, and collecting system

  • Useful in congenital anomalies and surgical planning

CT Appearance

CT Pre-Contrast (Non-contrast CT):

  • Kidney shows soft-tissue density, cortex slightly higher than medulla

  • Detects renal calculi, hemorrhage, or calcifications

CT Post-Contrast (Contrast-enhanced CT):

  • Corticomedullary phase: cortex enhances more than medulla

  • Nephrographic phase: uniform enhancement of renal parenchyma

  • Excretory phase: opacification of collecting system, ureter, and bladder

  • Useful for renal masses, trauma, and obstruction

CT Venography (CTV):

  • Visualizes right renal vein drainage into IVC

  • Essential in detecting renal vein thrombosis, tumor thrombus, and vascular anomalies

MRI images

Right kidney MRI coronal image anatomy image -img-00000-00000

MRI images

Right kidney MRI sagittal image anatomy image -img-00000-00000

CT images

Right kidney CT axial image

CT images

Right kidney CT coronal image