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Updated: May 29, 2026
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Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches
Published on: September 5, 2025
Anatomic renal artery branch microdissection to facilitate zero-ischemia partial nephrectomy
Casey K Ng1, Inderbir S Gill, Mukul B Patil
1USC Institute of Urology, Center for Advanced Robotic and Laparoscopic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
European Urology
|September 13, 2011
Summary
Targeted vascular microdissection enables zero-ischemia partial nephrectomy for challenging medial tumors, eliminating the need for hilar clamping and improving patient outcomes.
Area of Science:
- Urology
- Surgical Oncology
- Minimally Invasive Surgery
Background:
- Partial nephrectomy (PN) for medial renal tumors is challenging, especially without renal hilum clamping.
- Previous techniques limited the feasibility of unclamped PN for complex cases.
Purpose of the Study:
- To evaluate the efficacy of targeted vascular microdissection (VMD) in performing zero-ischemia PN for challenging medial renal tumors.
- To determine if VMD facilitates unclamped PN in complex cases.
Main Methods:
- Prospective cohort study of 44 patients undergoing robot-assisted or laparoscopic zero-ischemia PN.
- Group 1 (n=22) underwent VMD, including preoperative imaging, targeted artery dissection, bulldog clamping, and controlled hypotension.
- Group 2 (n=22) underwent PN without VMD.
Main Results:
- VMD group tumors were larger, more medial, hilar, and complex (higher RENAL nephrometry scores).
- Despite increased complexity, no VMD cases required hilar clamping.
- Perioperative outcomes, including operating time, blood loss, and complication rates, were similar between groups. All surgical margins were negative for cancer.
Conclusions:
- Anatomic VMD of renal artery branches enables successful zero-ischemia PN, even for complex medial and hilar tumors.
- This technique eliminates the need for renal hilum clamping in most PN cases.
- Global renal ischemia can be avoided in the majority of partial nephrectomies.
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