Marilyn J. Siegel, MD

Professor of Radiology

Clinical Expertise:
Cardiothoracic Pediatric Radiology
Marilyn J. Siegel, MD, is a professor of radiology and pediatrics at Mallinckrodt Institute of Radiology (MIR) at Washington University School of Medicine in St. Louis. Siegel was MIR’s first female chief resident in radiology and, later, its first female professor of radiology. She helped develop computed tomography (CT) into a tool that has changed patient treatment and outcomes, working to reduce children’s exposure to radiation during CT scans. An internationally recognized expert on diagnostic imaging of children, Siegel has received invitations to speak all over the world. In 2018, the Society for Advanced Body Imaging recognized her accomplishments with the Gold Medal, its highest award. She is also co-director of the NIH-funded Imaging Response Assessment Core (IRAC) at Washington University, where she is responsible for response assessment in clinical trial studies at the university.   Siegel is the author of over 336 journal articles, 54 chapters, and 20 books, including “Pediatric Sonography,” a definitive guide to the use of ultrasound in pediatric patients, now in its fifth edition. She is an alumna of MIR’s diagnostic radiology residency and pediatric radiology fellowship, in addition to a pediatric oncology fellowship at Seattle Children’s Orthopedic Hospital and a pediatric residency at Cardinal Glennon Memorial Hospital.

Clinical Interests

oncologic imaging, tumor response assessment, pediatric ultrasound, radiation doses and dose reduction technologies

Research Interests

early disease diagnosis in children and adults, teaching resources and tools development, tumor response measures evaluation

Link to Publications

Education History


Pediatric Radiology, Mallinckrodt Institute of Radiology, Washington University School of Medicine in St. Louis Pediatric Oncology, Children's Orthopedic Hospital


Diagnostic Radiology, Mallinckrodt Institute of Radiology, Washington University School of Medicine in St. Louis Pediatrics, Cardinal Glennon Memorial Hospital

Medical Degree

State University of New York


Washington University in St. Louis


American College of Radiology
Editorial Board and Editor, Journal of Perinatology
Editorial Board and Editor, Clinical Pediatrics
Radiological Society of North America
Society of Pediatric Radiology
American Roentgen Ray Society
Society of Computed Body Tomography
Chair, Imaging Committee, Children’s Oncology Group


2018 Gold Medal, Society for Advanced Body Imaging
2005-2006 Distinguished Scientist, Armed Forces Institute of Radiology
1994 Harry Z. Mellins Master Teacher Award in Radiology, State University of New York at Brooklyn
1989 Fellow, American College of Radiology
1984, 1989 Teacher of the Year, Mallinckrodt Institute of Radiology