Genitourinary Pathology Fellowship


At Stanford we offer a dedicated Genitourinary Pathology Fellowship (ACGME accredited) that will provide in-depth training in GU pathology with the goal of becoming a specialist in the field. The Stanford Genitourinary Pathology Service is rich with both routine GU pathology and advanced consultative material to learn from. Graduated responsibility opportunities include a Junior Attending rotation, presenting at GU tumor boards, teaching opportunities (such as departmental fellow-led teaching conferences), and service as a point person and consultant on GU-pathology-related issues. 

Elective and research time can be used to pursue additional subspecialty training in other areas (such as GYN, GI, or renal pathology) or to work on research projects. Departmental resources and support are available for clinicopathologic and translational research projects.  

The Department of Pathology accepts 1 GU pathology fellow per year.

Stanford establishes PGY levels for new fellows based on the successful completion of all prerequisite training required for entry into your fellowship program. Stanford does not recognize additional training beyond the prerequisite training requirements when establishing the PGY level for entry into the program.


We offer a one-year GU fellowship that provides advanced, focused, and intensive training in diagnostic genitourinary pathology:

  • GU service fellowship rotation (consults, in house overflow cases, second reviews,
    tumor board coverage, overall service point person)
  •  “Junior Attending” rotation (fellow reviews GU cases with assigned residents at “sign-out” and works up cases as if going to finalize independently, with hand-off to GU pathology faculty for report finalization and discussion)
  • Frozen section rotation
  • Surgical pathology selectives (including “Hotseat”: preliminary review of all cases prior to residents with focus on GU bench) 
  • Research
  • Elective
  • Vacation and educational/conference leave (4 weeks total)

Sample Rotation Schedule

Each Block is 4 weeks; 13 blocks x 4 weeks per block = 52 weeks (1 year). One Genitourinary (GU) service fellow rotation may be at the VA. Elective is any rotation within the Department of Pathology at SHC, including research. Selective is any surgical pathology rotation within the Department of Pathology, including medial renal pathology and hot seat. The GU fellow is permitted 3 weeks of pre-scheduled vacation and 1 week of conferences at times approved by the program director. 


Application due end of August, 2 years prior to start date; applications reviewed on a rolling basis.
Current open position(s): 2024-2025.


Duration: 1 year
Prerequisites: 3 yrs AP or 4 yrs AP/CP
Director: Chia-Sui (Sunny) Kao, MD

In general, applications should be submitted by August 30th in the calendar year that is two years before your fellowship start date (for example, application due date is August 30th, 2018 for GU fellowship starting July 1st, 2020).  Interviews will occur in early fall.

Send applications electronically to:

Chia-Sui (Sunny) Kao, MD
Phone: (650) 723-8824

Fellowship Program Coordinator

Rachael Buenafe-Jacinto

Current Fellows

Osama Khan, MD
Medical School: Saba University School of Medicine
Residency: University of Ottawa

Incoming Fellows

Patrick Mullane, MD (2022-2023)

Genitourinary Faculty

Chia-Sui 'Sunny' Kao, MD

Assistant Professor of Pathology and Urology
Director of Genitourinary Pathology

Dr. Kao is an Assistant Professor of Pathology at Stanford University. She earned her bachelor and medical degrees from Indiana University. She completed her pathology residency training in Anatomic and Clinical Pathology at Indiana University School of Medicine, followed by a Genitourinary Pathology fellowship at Massachusetts General Hospital. She is board certified in both Anatomic Pathology and Clinical Pathology (American Board of Pathology). She was recently awarded ASCP’s 2016 40 under Forty. Her research interests include testicular neoplasms as well as bladder and kidney cancers.

Graduated Fellows