The technique of percutaneous renal biopsy. How to minimize risk while ensuring adequate tissue sampling.

Percutaneous renal biopsy is useful in diagnosing a variety of kidney disorders, as well as certain systemic diseases with renal and/or nonrenal manifestations. The procedure is performed while the kidney is viewed by continuous ultrasonographic imaging. The kidney is first located with a spinal needle and the area is anesthetized. The biopsy needle is then inserted and advanced toward the capsule. When the capsule is pierced, the trochar is advanced into the renal cortex. The sheath is lowered, encompassing the cutting edge and the core biopsy sample. Complications, although rare, may include the creation of an arteriovenous malformation and laceration of the kidney or other intra-abdominal organ; close monitoring after the procedure is therefore required.