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Gadolinium contrast medium is generally very safe. Side effects or reactions are uncommon, but can occur. In patients with normal kidney function, most of the gadolinium contrast medium injected (over 90%) is passed out in the urine within 24 hours.
The areas between the pyramids are called renal columns. The kidneys are regulatory organs which filter the blood to remove waste products, salts and water which are then secreted from the kidneys as urine. The main functional unit of the kidney is the nephron, and there are over a million nephrons in each kidney.he areas between the pyramids are called renal columns. The kidneys are regulatory organs which filter the blood to remove waste products, salts and water which are then secreted from the kidneys as urine. The main functional unit of the kidney is the nephron, and there are over a million nephrons in each kidney.