Optimizing renal cortical neoplasm tissue sampling through a modified biopsy technique: laboratory experience and...

Area of Science:

• Nephrology
• Urology
• Surgical Innovation

Background:

• Renal biopsy is crucial for diagnosing kidney diseases and guiding treatment.
• Current biopsy techniques may have limitations in sample quality and diagnostic accuracy.
• Laparoscopic renal cryoablation procedures require reliable pre-procedural tissue diagnosis.

Purpose of the Study:

• To evaluate the effectiveness of 11 biopsy devices using standard and novel techniques in a porcine model.
• To compare the quality of renal biopsy samples obtained by different techniques.
• To apply laboratory findings to improve biopsy results during clinical laparoscopic renal cryoablation.

Main Methods:

• 11 biopsy devices were tested on porcine renal tissue using two techniques: external deployment (Group 1) and standard insertion (Group 2).
• Biopsy quality was assessed by core length, width, and the number of glomeruli and vessels.
• The optimal technique was confirmed in 10 clinical laparoscopic renal cryoablation procedures, comparing standard and modified biopsies.

Main Results:

• The modified technique (Group 1) yielded significantly longer core lengths (7.32 mm vs. 4.91 mm) and more glomeruli (7.6 vs. 4.2) compared to the standard technique (Group 2) (P <0.01).
• Clinically, the modified biopsy technique achieved a diagnostic yield of 90% (9/10 cases), compared to 70% (7/10 cases) for the standard technique.
• Histopathologic diagnosis was successfully obtained in all 10 clinical cases using the modified technique.

Conclusions:

• The modified renal biopsy technique demonstrated superior sample quality and diagnostic accuracy in both laboratory and clinical settings.
• This novel technique is effective and safe for improving biopsy outcomes, particularly during laparoscopic renal cryoablation.
• Preliminary data support the clinical utility of the modified biopsy technique for enhanced renal mass evaluation.