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Lymph node ultrasounds more accurate in obese breast cancer patients
Date:4/30/2014

ROCHESTER, Minn. Mayo Clinic research into whether ultrasounds to detect breast cancer in underarm lymph nodes are less effective in obese women has produced a surprising finding. Fat didn't obscure the images and ultrasounds showing no suspicious lymph nodes actually proved more accurate in overweight and obese patients than in women with a normal body mass index, the study found. The research is among several Mayo studies presented at the American Society of Breast Surgeons annual meeting April 30-May 4 in Las Vegas.

Researchers studied 1,331 breast cancer patients who received ultrasounds of their axillary lymph nodes, the lymph nodes in the armpits, to check for cancer before surgery. Of those patients, 36 percent were considered obese, with a body mass index of 30 or more. Body mass index is a formula that uses weight and height to estimate body fat. Of the other women studied, 33 percent were of normal weight and 31 percent were overweight but not obese.

Obesity can change lymph nodes, including the way they look in imaging studies, and make physical examination of underarm lymph nodes more challenging. The Mayo study found that higher body weight didn't muddy ultrasounds of the axillary lymph nodes in overweight or obese cancer patients, and that their ultrasounds had better specificity and accuracy than those of thinner women, meaning that when ultrasound showed no suspicious lymph nodes, it was likelier to be correct.

"I think we were surprised at these results," says senior author Tina Hieken, M.D., a breast cancer surgeon at Mayo Clinic. ``It should be very reassuring that regardless of the weight of the patient, axillary ultrasound is helpful."

Potential reasons for the findings, Dr. Hieken speculates: Soft fatty tissue can be compressed during ultrasounds, and physicians now have more experience in knowing what lymph nodes may look like in overweight and obese patients. In some thin patients, ultrasounds may no
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Contact: Sharon Theimer
newsbureau@mayo.edu
507-284-5005
Mayo Clinic
Source:Eurekalert

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