Hematopathology Consultation Service


In addition to comprehensive hematopathology services (morphology, flow cytometry, molecular, and cytogenetic studies), we provide second opinion consultation on hematopathology cases. Pathology cases may be sent to us by pathology or clinical colleagues, or initiated by patients and their families. As a group, we are comprised of internationally recognized experts in the areas of lymphoma and leukemia, and active in contributing to the field of hematopathology through clinical and translational research, as well as diagnostic teaching seminars and courses. In total, we have published over 300 journal articles, books, chapters, and guidelines and are continually active as speakers and leaders in courses and seminars on clinical hematopathology.


Robert S. Ohgami, MD, PhDRobert (Bob) Ohgami, MD, PhD
Chief of Hematopathology

Dr. Ohgami is an internationally recognized hematopathologist and recipient of a Berard-Dorfman Founders Award in 2016 from the Society for Hematopathology. Following an MD, PhD at Harvard University and MIT, he later went on to residency and hematopathology fellowship at Stanford University. There he was an Associate Professor of Pathology, Associate Program Director for Anatomic Pathology, and Director of the Molecular Pathology Core. He is on the editorial board of the Journal of Molecular Diagnostics, and a recent Editor-in-Chief of the Atlas of Cytogenetics and Genetics in Oncology and Haematology. A recognized authority on leukemias and lymphomas, Dr. Ohgami’s translational research lab compliments his diagnostic work, pushes the threshold of molecular and computational pathology, and allows for the study of new and known leukemias and lymphomas. A dedicated mentor and teacher, he has received faculty teaching awards at Stanford University in both clinical and anatomic pathology in 2014 and 2016.


Ryan Gill, MD, PhDRyan M. Gill, MD, PhD
Director of Surgical Pathology

Dr. Ryan Gill, Director of Surgical Pathology is an internationally recognized leader in Hematopathology-GI/Liver pathology with a high volume consultative practice. Dr. Gill carries both broad knowledge in hematopathology, and specific expertise in the diagnosis of lymphomas and leukemias involving the GI tract and liver. Dr. Gill has published numerous book chapters and peer-reviewed articles on hematopathology, liver and gastrointestinal pathology and lectures around the world.


Kwun Wah Wen, MD, PhDKwun Wah Wen, MD, PhD
Assistant Professor

Dr. Kwun Wah Wen is a Hematopathologist and GI Pathologist with broad expertise in leukemias and lymphomas and specific interest in hematolymphoid neoplasms of the GI tract and CNS. He is a recipient of Arthur Purdy Stout Award, a Gastrointestinal Pathology Society Award, and most recently the F. Stephen Vogel Award for his clinical research in developing DNA flow cytometry on formalin-fixed tissue for diagnostic and prognostic purposes. He is active as an editorial reviewer in pathology, written dozens of publications and has served on the USCAP Education Committee (2017-2019) and is currently on the USCAP Vogel Award Committee (2019-2022). Due to his broad expertise and knowledge in hematopathology, he is continually sought out for help in complex pathology cases.


Roberto Ruiz-Cordero, MDRoberto Ruiz-Cordero, MD
Assistant Professor

Dr. Roberto Ruiz-Cordero has expertise in five different areas of pathology including anatomic and clinical pathology, hematopathology, cytopathology, and molecular genetic pathology. In addition to bone marrow diagnostic services, he provides a unique service to our department in performing fine needle aspiration biopsies on lymph nodes and other organs. His combined knowledge in hematopathology, cytopathology, and molecular genetic pathology allows him to make definitive diagnoses of lymphoma using a minimally invasive approach. Dr. Ruiz-Cordero applies this wide range of expertise to his research focused on harnessing the power of genomics to better diagnose patients. He is an elected Editorial Member of the journal Medicina & Laboratorio, as well as an ad hoc reviewer for Cancer Genetics, Scientific Reports, Cancer Cytopathology, and Haematologica.