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Patient positioning could affect breast MRI accuracy

A new study has found that the positioning of a woman could influence the accuracy of breast MRI.

Patient positioning could affect breast MRI accuracy

The study done by a team of radiologists at Brigham and Women's Hospital in Boston suggests that MRI images taken before breast cancer surgery could provide incorrect data if the woman is placed face-down during the scan.

In contrast, "supine [face up] MRI before surgery may provide surgeons with more detailed and accurate information, and could lead to effective tumor removal," lead researcher and radiologist Dr. Eva Gombos said in a hospital news release.

"The real benefit of breast MRI in a patient with breast cancer is preoperative planning, to determine if there is additional cancer in the same breast or in the other breast prior to surgery," explained Dr. Kristin Byrne. She is a radiologist at Lenox Hill Hospital in New York City who reviewed the study findings.

It is to be noted that many of these MRIs are performed while the patient is face-down. There's a reason for that, Byrne said. "When the patient is on her back, the breasts often droop to the sides at different angles and it can look different each time they are imaged, leading to misinterpretation," she explained.

In the study, Gombos and colleagues looked at 12 breast cancer patients undergoing lumpectomy. Six patients were asked to have have MRI breast scans both before and after their surgeries.

Overall, the face-down (prone) position during MRI resulted in significant deformity (on the scan) of both the breast and the tumor's position within the breast. The findings of the study were published on June 22 in the journal Radiology.

There was "change in size and shape caused by displacement and deformation of the tumor between standard imaging in the prone position and operative supine position," Gombos reported.