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Image-guided biopsy can help patients avoid unnecessary kidney removal

Percutaneous image-guided biopsy of renal masses is safe and accurate, and it frequently alters clinical decision making, says a new study from the University of Michigan.

For the study, the researchers reviewed 153 kidney biopsies in 126 patients. The researchers found that more than 60% of patients had a change in their treatment--whether surgery, tumor ablation, chemotherapy or radiation--due to biopsy results, and that as many as 75 unnecessary kidney removals were potentially avoided.

"When a patient has a kidney mass, options include an open surgical procedure or an image-guided percutaneous biopsy. Percutaneous means that the procedure is performed through the skin, through a tiny incision (only 3-4 mm). Imaging guidance (either ultrasound or CT) allows us to watch our needle as it enters the mass, decreasing the risk of damage to adjacent structures and ensuring that we are sampling the correct tissue," said Katherine Maturen, MD, lead author of the study.

According to the researchers, these procedures are performed under conscious sedation with local anesthesia to numb the skin where the needle will enter. The procedure takes about half an hour in most cases, and after a four-hour observation period, patients are free to go home.

According to the researchers, although the acceptance of percutaneous image-guided biopsy has increased among physicians in recent years, many continue to avoid the biopsies because of concerns about poor sensitivity and a high rate of non-diagnostic biopsy, all based on data from old techniques including fine needle aspiration. "We felt it was important to demonstrate that newer core biopsy techniques have a much greater success rate, and to quantify the extent to which these biopsies altered patient management," said Dr. Maturen.

"When a patient has a kidney mass, it isn't always clear what the treatment should be until we know the tissue type. Sometimes getting a small sample of ti
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Contact: Necoya Lightsey
necoya@arrs.org
604-647-7413
American Roentgen Ray Society
1-May-2006


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