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Former DHMC radiologist reaches settlement over misread mammograms

Valley News Staff Writer
Published: 9/18/2019 2:00:17 PM
Modified: 9/18/2019 10:29:34 PM

LEBANON — A former Dartmouth-Hitchcock radiologist has reached a settlement with the New Hampshire Board of Medicine after failing to detect breast cancer in “a number” of patients who were later found to have the disease.

As part of the agreement, which the Board of Medicine released Tuesday, Dr. Mark Guilfoyle, of Jefferson, N.H., acknowledges that the board has evidence that he engaged in “professional misconduct.”

As a result of the agreement, he is required to pay a $750 fine and will not read and interpret mammograms “for as long as he is a licensed physician in New Hampshire.”

Guilfoyle resigned from D-H in 2018 while hospital officials were conducting a “quality assurance peer review” of mammogram interpretations that he had performed at Dartmouth-Hitchcock Medical Center between 2015 to 2018.

His resignation triggered an investigation by the state board, which found that he “had failed to detect evidence of breast cancer in a number of patients who were eventually diagnosed with breast cancer.”

Penny Taylor, the administrator for the board, said in an email on Tuesday that she could not provide more information than is in the agreement, including how many patients were affected.

D-H spokesman Rick Adams declined to comment in an email on Wednesday.

An email seeking comment from Guilfoyle’s attorney Nicholas Casolaro, of the Concord-based firm Cleveland, Waters and Bass, was not returned.

There were no concerns about Guilfoyle’s abilities to interpret other types of imaging, the agreement said.

He earned his medical degree from Michigan State University College of Osteopathic Medicine in 1984, did an internship at Michigan Osteopathic Medical Center in Detroit in 1985 and did a residency at Detroit Osteopathic Hospital/Bi-County Community Hospital in 1988, according to the New Hampshire Online Licensing website.

Nora Doyle-Burr can be reached at or 603-727-3213.

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