Stephen E. Fleming, MD

About Me

I am a diagnostic radiologist and nuclear medicine physician with fellowship training in body imaging. My role in the care of patients at Memorial Sloan Kettering involves interpretation of positron emission tomography (PET), computed tomography (CT), ultrasound, and general molecular imaging. I aid in the diagnosis, staging, and follow-up evaluation of patients during treatment. I am also involved in teaching, multidisciplinary research, and multidisciplinary conferences. I am an active member of several professional organizations including American College of Radiology, American Roentgen Ray Society, Radiological Society of North America, and Society of Nuclear Medicine.  I currently participate in several clinical trials evaluating treatment approaches for breast, prostate, gynecologic cancers, and lymphomas.

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I am involved in the expansion of Memorial Sloan Kettering’s services to our Long Island patients at our regional facility in Commack, New York.  Since we started providing PET/CT services at Commack in spring 2011, I have participated in performing and interpreting PET/CT exams for our patients at that facility. I am also involved in CT and ultrasound at our Manhattan and Commack sites and provide ultrasound-guided thyroid biopsies at the main campus in Manhattan.

  • Clinical Expertise: CT, Ultrasound, General Nuclear Medicine, and Positron Emission Tomography
  • Languages Spoken: English
  • Education: MD, Mercer University School of Medicine
  • Residencies: Ochsner Clinic Foundation
  • Fellowships: New York University
  • Board Certifications: Radiology; Nuclear Medicine


Most major health insurers offer plans that include MSK as one of their in-network providers. If MSK is in-network, it means all our doctors are too. Medicaid and New York State Medicare also provide benefits for care at MSK.

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Clinical Trials

As home to one of the world’s top cancer research centers, Memorial Sloan Kettering is typically involved in more than 900 clinical trials at a given time. Currently, clinical trials focused on the conditions I treat are enrolling new patients. If you’re interested in joining a clinical trial, click to learn about the trial’s purpose, eligibility criteria, and how to get more information.

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