Ryan Kohlbrenner, MD, is an Associate Professor in Interventional Radiology in the Department of Radiology and Biomedical Imaging at the University of California, San Francisco. He received his medical degree from the University of Chicago Pritzker School of Medicine, Illinois, and he completed a one-year internship at Washington University, St. Louis/Barnes - Jewish Hospital, Missouri. Dr. Kohlbrenner completed his four-year diagnostic radiology residency at the University of California, San Francisco and served as chief resident in his senior year. He subsequently completed his Interventional Radiology fellowship at University of California, San Francisco.
Primary research interests of Dr. Kohlbrenner include computer-aided diagnosis, image processing, and radiation dose reduction for patients undergoing interventional procedures. His clinical interests include percutaneous liver and kidney ablations, prostate artery embolization for benign prostatic hyperplasia (BPH), and transarterial interventions for hepatocellular carcinoma and liver metastases.
Expertise:
Interventional Radiology
Specialty:
Kidney ablation, prostate artery embolization, liver ablation, transarterial chemoembolization and radioembolization
Professional Interests:
Radiation dose reduction, benign prostatic hyperplasia (BPH), renal cell carcinoma, hepatocellular carcinoma, and liver metastases
Education and Training:
• Medical School: University of Chicago Pritzker School of Medicine, Illinois
• Internship: Washington University, St. Louis/Barnes- Jewish Hospital, Missouri
• Residency: University of California, San Francisco
• Fellowship: University of California, San Francisco – Interventional Radiology
Honors and Awards
Graduated with Honors, University of Chicago – Pritzker School of Medicine, 2010
Alpha Omega Alpha, Alpha Omega Alpha Medical Honor Society, 2009
Computer Science Achievement Award, University of Southern California, 2006
Graduated with Highest Honors in Computer Science, University of Southern California, 2006
Publications
Kohlbrenner R, Wu X, Nguyen HG, Cooperberg MR, Chakravarty T, Carroll PR, Hope TA. Pharmacokinetic Comparison of Selective Prostatic Arterial and Intravenous PSMA PET/CT Radioligand Infusions in Primary Prostatic Adenocarcinoma. Radiology. 2024 08; 312(2):e232544.
Wu X, Zhou A, Heller M, Chi T, Kohlbrenner R. Comparison of Minimally Invasive Procedures for Benign Prostatic Hyperplasia: A Cost-effectiveness Analysis. Radiology. 2023 12; 309(3):e230555.
Wu X, Zhou A, Heller M, Kohlbrenner R. Prostatic Artery Embolization Versus Transurethral Resection of the Prostate for Benign Prostatic Hyperplasia: A Cost-Effectiveness Analysis. J Vasc Interv Radiol. 2022 12; 33(12):1605-1615.
Kohlbrenner R, Schwertner AB, Vogel AR, Conrad M, Lokken RP. Large thrombosed portomesenteric venous aneurysm treated with pharmacomechanical thrombolysis combined with TIPS placement. CVIR Endovasc. 2022 Feb 08; 5(1):11.
Kohlbrenner R, Fidelman N, Kohi MP, Kumar V, Kolli KP. Onyx embolization of an enlarging arterioportal pancreatic AVM using a balloon-occlusion microcatheter. Diagn Interv Radiol. 2021 05; 27(3):458-459.
Schwertner A, Kohlbrenner RM, Seeley EJ, Lokken RP. Nonfibered Packing Coil Embolization of Pulmonary Artery Pseudoaneurysm Resulting in a Delayed Endobronchial Coil Migration. J Vasc Interv Radiol. 2021 04; 32(4):626-628.
Mirza MH, Schwertner A, Kohlbrenner R, Dowd CF, Narsinh KH. Intracranial hemorrhage due to central venous occlusion from hemodialysis access: A case report. Interdiscip Neurosurg. 2021 Jun; 24.
Knox J, Kohlbrenner R, Kolli K, Fidelman N, Kohi MP, Lehrman E, Lokken RP, Zagoria R, Kerlan RK, LaBerge J, Taylor AG. Intermediate to Long-Term Clinical Outcomes of Percutaneous Cryoablation for Renal Masses. J Vasc Interv Radiol. 2020 Aug; 31(8):1242-1248.
Fidelman N, Johanson C, Kohi MP, Kolli KP, Kohlbrenner RM, Lehrman ED, Taylor AG, Kelley RK, Yao FY, Roberts JP, Kerlan RK. Prospective Phase II trial of drug-eluting bead chemoembolization for liver transplant candidates with hepatocellular carcinoma and marginal hepatic reserve. J Hepatocell Carcinoma. 2019; 6:93-103.
Knox J, Watson E, Fidelman N, Taylor AG, Kolli K, Lehrman E, Kohlbrenner R, Kohi MP. Outcomes after Peripancreatic Fluid Drainage in Patients with Simultaneous Pancreas-Kidney Transplantation. J Vasc Interv Radiol. 2019 Jun; 30(6):918-921.
Kumar V, Szeto H, Lehrman ED, Kohlbrenner RM, Kolli PK, Wilson MW, Kohi MP. Expanding the Teaching Toolbox: Characterizing Utility of a Web-Based Lecture Series in Educating Future Colleagues and Referrers about the Field of IR. J Vasc Interv Radiol. 2019 Apr; 30(4):589-593.e3.
Lee KA, Taylor A, Bartolome B, Fidelman N, Kolli KP, Kohi M, Kohlbrenner R, Laberge J, Lehrman E, Kerlan R. Safety and Efficacy of Transjugular Liver Biopsy in Patients with Left Lobe-Only Liver Transplants. J Vasc Interv Radiol. 2019 Jul; 30(7):1043-1047.
Kohlbrenner R, Lehrman ED, Taylor AG, Kohi MP, Fidelman N, Kumar V, Conrad M, Kolli KP. Operator Dose Reduction during Transjugular Liver Biopsy Using a Radiation-Attenuating Drape: A Prospective, Randomized Study. J Vasc Interv Radiol. 2018 09; 29(9):1248-1253.
Kohlbrenner R, Kolli KP, Taylor AG, Kohi MP, Lehrman ED, Fidelman N, Conrad M, LaBerge JM, Kerlan RK, Gould R. Radiation Dose Reduction during Uterine Fibroid Embolization Using an Optimized Imaging Platform. J Vasc Interv Radiol. 2017 Aug; 28(8):1129-1135.e1.
Kohi MP, Kohlbrenner R, Kolli KP, Lehrman E, Taylor AG, Fidelman N. Catheter directed interventions for acute deep vein thrombosis. Cardiovasc Diagn Ther. 2016 Dec; 6(6):599-611.
Kohlbrenner R, Kolli KP, Taylor AG, Kohi MP, Fidelman N, LaBerge JM, Kerlan RK, Agarwal VK, Lehrman ED, Nanavati S, Avrin DE, Gould R. Patient Radiation Dose Reduction during Transarterial Chemoembolization Using a Novel X-Ray Imaging Platform. J Vasc Interv Radiol. 2015 Sep; 26(9):1331-8.
Suzuki K, Epstein ML, Kohlbrenner R, Garg S, Hori M, Oto A, Baron RL. Quantitative radiology: automated CT liver volumetry compared with interactive volumetry and manual volumetry. AJR Am J Roentgenol. 2011 Oct; 197(4):W706-12.
Suzuki K, Kohlbrenner R, Epstein ML, Obajuluwa AM, Xu J, Hori M. Computer-aided measurement of liver volumes in CT by means of geodesic active contour segmentation coupled with level-set algorithms. Med Phys. 2010 May; 37(5):2159-66.
