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Colette Marie-Claire Magnant, M.D.

4.9 out of 5
177 Ratings
Photo of Dr. Colette Marie-Claire Magnant, M.D.

Director, Sullivan Breast Center, Sibley Memorial Hospital

Assistant Professor of Surgery


Languages: English, French

Expertise: Breast Conservation Surgery, Breast Surgery, Nipple-Sparing Mastectomy, Oncoplastic Breast Conservation Surgery

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Sibley Memorial Hospital
Appointment Phone: 202-243-5230

5255 Loughboro Road NW
Washington, DC 20016 map
Fax: 202-243-5221


Dr. Colette M. Magnant is a board certified breast surgeon at Sibley Memorial Hospital. She is the chair of the Sibley Cancer Committee and the director of the Sullivan Breast Center, of which she is also the founding physician. She practices out of the Sullivan Breast Center located in Sibley’s Renaissance building. Dr. Magnant makes patients aware of all surgical options for their breast cancer treatment and how the surgical decisions impact the overall plan of care. 

Dr. Magnant has a general expertise in surgery, including breast conserving surgery, nipple sparing, skin sparing mastectomy and oncoplastic techniques to improve cosmetic outcomes. 

Dr. Magnant earned her medical degree from Virginia Commonwealth University Medical College and completed an internship at Indiana University School of Medicine. She completed a residency in general surgery at Georgetown University Hospital. Dr. Sullivan founded the Sullivan Breast Center at Sibley in 1998 with the goal of providing multidisciplinary care for breast cancer patients in a collaborative environment that includes breast imaging, breast surgery, breast reconstruction, radiation oncology, medical oncology, physical therapy and other key services. 

Dr. Magnant is a fellow of the American College of Surgeons. She has been named a Regional Top Doctor by Castle Connolly. 

Dr. Magnant has contributed to numerous publications and presentations. more


  • Director, Sullivan Breast Center, Sibley Memorial Hospital
  • Assistant Professor of Surgery
  • Assistant Professor of Gynecology and Obstetrics

Departments / Divisions



  • MD, Virginia Commonwealth University School of Medicine (1981)


  • MedStar Georgetown University Medical Center / General Surgery (1986)

Board Certifications

  • American Board of Surgery / Surgery (1988)

Research & Publications

Selected Publications

View all on Pubmed

Tercyak KP, Peshkin BN, Brogan BM, DeMarco T, Pennanen MF, Willey SC, Magnant CM, Rogers S, Isaacs C, Schwartz MD. "Quality of life after contralateral prophylactic mastectomy in newly diagnosed high-risk breast cancer patients who underwent BRCA1/2 gene testing." J Clin Oncol. 2007 Jan 20;25(3):285-91.

Hogge JP, De Paredes ES, Magnant CM, Lage J. "Imaging and Management of Breast Masses During Pregnancy and Lactation." Breast J. 1999 Jul;5(4):272-283.

Activities & Honors


  • Regional Top Doctor, Castle Connolly


  • American College of Surgeons

Professional Activities

  • Chair, Sibley Cancer Committee, Sibley Memorial Hospital
  • Partner, The Judith A. Lese Foundation

Videos & Media

Recent News Articles and Media Coverage

A Rockville Mother’s Battle with Breast Cancer. Bethesda Magazine (September/October, 2016)

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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