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High-power MRI helps Mayo Clinic surgical team predict outcomes in unusual tumor cases

ROCHESTER, Minn. -- A Mayo Clinic surgical team has found that using a 3-Tesla MRI in surgical decision making provides a new level of capability to predict surgical outcomes that improves patient care by minimizing the potential for unsuccessful tumor-removal surgeries. The Mayo Clinic report appears in the December issue of the Journal of Neurosurgery www.thejns-net.org/jns/issues/current/toc.html.

In their report, Mayo physicians describe a case study of five patients. Four had neurofibromatosis, a condition with a predisposition to nerve-related tumors. All patients suffered from growths called "sciatic notch dumbbell-shaped" tumors. The tumors were benign, but resulted in neurologic dysfunction and disabling pain.

"In the past, if surgeons couldn't tell prior to surgery where the exact location of the large tumor was in relation to the sciatic nerve, it meant they couldn't predict in which cases surgery could be performed safely," explains Robert Spinner, M.D., the lead neurosurgeon on the Mayo Clinic team.

The team used an advanced magnetic resonance imaging (MRI) system performed on a 3-Tesla magnet to help identify suitable candidates for a difficult tumor-removal surgery. A Tesla is a unit of magnet strength. A 3-Tesla is one of the strongest commercially available.

Significance of the Mayo Clinic Case Study

A standardized surgical approach for safe and complete removal of sciatic notch dumbbell-shaped tumors has been problematic for at least three reasons. These tumors are:

  • relatively rare and therefore hard to study
  • anatomically difficult to reach and remove without injuring the main sciatic nerve
  • difficult to visualize before surgery with enough detail to distinguish tumor boundaries from nerve

The current Mayo Clinic report begins to change this situation by documenting a new
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Contact: Carol Lammers
newsburea@mayo.edu
507-284-5005
Mayo Clinic
11-Jan-2007


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