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Renal Parenchymal Biopsy

Tissue sampling of the renal parenchyma is performed under image guidance, commonly CT or ultrasound. It is often performed on outpatient basis. The patient commonly lies on the procedure table on the belly. The initial CT images are obtained. The target area commonly in the lower pole of the kidney is determined and the biopsy device cannula entry site is marked on the skin. Then, the access site is sterilized. The access area is covered by a surgical drape. The skin and renal capsule are numbed with a local anesthetic at the access site. A very small nick may be made in your skin to make it easier to pass the needle into the kidney. Then, the tip of a cannula is advanced and placed within the renal parenchyma just passed the capsule under CT guidance. The biopsy device is prepared, and then advanced through the biopsy cannula into the cortex of the kidney. Subsequently, multiple passes are performed to obtain required parenchymal samples. The entire procedure usually takes between 30 to 60 minutes. At the end of the procedure, the biopsy cannula is removed, and dressing is applied at the opening on the skin.