On April 10, 2008, a Notice of Violation was issued for a Severity Level III violation. The violation involved the failure to develop, implement and maintain written directive procedures to provide high confidence that each administration was in accordance with the written directive. Specifically, the licensee's written procedures for the implementation of treatment plans with its stereotactic radiosurgery unit did not require a check of the treatment plan parameters and magnetic resonance image orientation prior to administration of the treatment. As a result, the licensee administered a single gamma knife treatment to an unintended portion of the patient's brain.