Dr. Hassan earned his medical degree at Chicago Medical School in, North Chicago, IL, receiving a distinction in basic sciences. He completed a general surgery internship, diagnostic radiology residency, and fellowship in abdominal imaging and diagnostic sonography all at UCSF.
During residency, Dr. Hassan co-led the radiology section’s quality improvement initiative at the Zuckerberg San Francisco General Hospital, examining delays in morning turnaround times of overnight, resident-read radiology examinations and implemented a system to improve the time from wet read to final attending reads of reports.
Dr. Hassan conducts research as part of the Cirrhosis & Hepatocellular Carcinoma Working Group, establishing a database of over 200 patients with treated HCC for the current largest radiologic-pathologic correlation of treatment modalities in a multidisciplinary collaboration of diagnostic and interventional radiologists and transplant hepatologists. Dr. Hassan has published papers imaging in gender affirmation surgery, organic cation transporter-mediated clearance of cardiovascular drugs, and currently has a paper in progress on the imaging reliability of liver tumor grading (LI-RADS)
Publications
El Homsi M, Hassan OT, O'Brien C, Singh C, Arif-Tiwari H, Becker-Weidman DJ, Karolyi D, Bonde A, Venkatesh SK, Brunsing RL, Cunha GM, Miller FH, Costello J, Qayyum A, Marks RM. Standardized reporting of extrahepatic cholangiocarcinoma. Abdom Radiol (NY). 2025 Sep 13.
Fields BKK, Hassan OT. An MRI Histopathology-based Deep Learning Approach for the Classification of Prostate Cancer. Radiol Imaging Cancer. 2025 Sep; 7(5):e250466.
Hassan OT, Behr SC, Ohliger MA, Fowler KJ, Gill RM, Fidelman N, Mehta N, Choi HH. Per-patient Negative Predictive Value of the CT and MRI Liver Imaging Reporting and Data System Version 2018 Treatment Response Algorithm for Hepatocellular Carcinoma. Radiology. 2023 12; 309(3):e222776.
Henderson MN, Mantopoulos D, Wheatley EI, Hassan OT, Prenner JL, Fine HF. Efficacy of Perioperative Intravenous Dexamethasone on Postoperative Analgesia in Scleral Buckle Surgery: A Randomized Clinical Trial. Ophthalmic Surg Lasers Imaging Retina. 2023 04; 54(4):238-242.
Hassan O, Sun D, Jha P. Imaging in Gender Affirmation Surgery. Curr Urol Rep. 2021 Jan 30; 22(2):14.
Livshetz I, Meghpara MB, Karam JA, Salem HS, Mont MA, Hassan OT, Goldberg BA. Do Demographic or Anthropometric Factors Affect Lateralization of the Tibial Tubercle in a Diverse Population? A Magnetic Resonance Imaging Analysis. Surg Technol Int. 2020 May 28; 36:304-308.
Hassan OT, Hassan RT, Arora RR. Organic Cation Transporter-Mediated Clearance of Cardiovascular Drugs: A Pharmacological Perspective. Am J Ther. 2016 May-Jun; 23(3):e855-61.
