Ryan Kohlbrenner, MD
Associate Professor
Radiology
School of Medicine

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

• Nonfibered Packing Coil Embolization of Pulmonary Artery Pseudoaneurysm Resulting in a Delayed Endobronchial Coil Migration.
  Journal of vascular and interventional radiology : JVIR 2021 Schwertner A, Kohlbrenner RM, Seeley EJ, Lokken RP
• Intracranial hemorrhage due to central venous occlusion from hemodialysis access: A case report.
  Interdisciplinary neurosurgery : Advanced techniques and case management 2021 Mirza MH, Schwertner A, Kohlbrenner R, Dowd CF, Narsinh KH
• Intermediate to Long-Term Clinical Outcomes of Percutaneous Cryoablation for Renal Masses.
  Journal of vascular and interventional radiology : JVIR 2020 Knox J, Kohlbrenner R, Kolli K, Fidelman N, Kohi MP, Lehrman E, Lokken RP, Zagoria R, Kerlan RK, LaBerge J, Taylor AG
• Prospective Phase II trial of drug-eluting bead chemoembolization for liver transplant candidates with hepatocellular carcinoma and marginal hepatic reserve.
  Journal of hepatocellular carcinoma 2019 Fidelman N, Johanson C, Kohi MP, Kolli KP, Kohlbrenner RM, Lehrman ED, Taylor AG, Kelley RK, Yao FY, Roberts JP, Kerlan RK
• Outcomes after Peripancreatic Fluid Drainage in Patients with Simultaneous Pancreas-Kidney Transplantation.
  Journal of vascular and interventional radiology : JVIR 2019 Knox J, Watson E, Fidelman N, Taylor AG, Kolli K, Lehrman E, Kohlbrenner R, 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.
  Journal of vascular and interventional radiology : JVIR 2019 Kumar V, Szeto H, Lehrman ED, Kohlbrenner RM, Kolli PK, Wilson MW, Kohi MP
• Safety and Efficacy of Transjugular Liver Biopsy in Patients with Left Lobe-Only Liver Transplants.
  Journal of vascular and interventional radiology : JVIR 2019 Lee KA, Taylor A, Bartolome B, Fidelman N, Kolli KP, Kohi M, Kohlbrenner R, Laberge J, Lehrman E, Kerlan R
• Operator Dose Reduction during Transjugular Liver Biopsy Using a Radiation-Attenuating Drape: A Prospective, Randomized Study.
  Journal of vascular and interventional radiology : JVIR 2018 Kohlbrenner R, Lehrman ED, Taylor AG, Kohi MP, Fidelman N, Kumar V, Conrad M, Kolli KP
• Radiation Dose Reduction during Uterine Fibroid Embolization Using an Optimized Imaging Platform.
  Journal of vascular and interventional radiology : JVIR 2017 Kohlbrenner R, Kolli KP, Taylor AG, Kohi MP, Lehrman ED, Fidelman N, Conrad M, LaBerge JM, Kerlan RK, Gould R
• Catheter directed interventions for acute deep vein thrombosis.
  Cardiovascular diagnosis and therapy 2016 Kohi MP, Kohlbrenner R, Kolli KP, Lehrman E, Taylor AG, Fidelman N
• Patient Radiation Dose Reduction during Transarterial Chemoembolization Using a Novel X-Ray Imaging Platform.
  Journal of vascular and interventional radiology : JVIR 2015 Kohlbrenner R, Kolli KP, Taylor AG, Kohi MP, Fidelman N, LaBerge JM, Kerlan RK, Agarwal VK, Lehrman ED, Nanavati S, Avrin DE, Gould R
• Quantitative radiology: automated CT liver volumetry compared with interactive volumetry and manual volumetry.
  AJR. American journal of roentgenology 2011 Suzuki K, Epstein ML, Kohlbrenner R, Garg S, Hori M, Oto A, Baron RL
• Computer-aided measurement of liver volumes in CT by means of geodesic active contour segmentation coupled with level-set algorithms.
  Medical physics 2010 Suzuki K, Kohlbrenner R, Epstein ML, Obajuluwa AM, Xu J, Hori M