KALAMAZOO, Mich., and WINNIPEG, Manitoba, May 13. An MRI-guided laser surgery method, in investigational use at both The Cleveland Clinic and University Hospitals Case Medical Center, holds promise for thousands of brain tumor patients and has earned clearance from the Food and Drug Administration (FDA) for use in neurosurgery. The first applications of the technology are expected to be for the treatment of otherwise inoperable brain tumors.