Dr. Dino Terzic got lucky the other day. In his seventh and final year as a neurosurgery resident at the University of Minnesota, the 32-year-old Bosnian got to operate on a rare type of brain aneurysm that required a special approach through the patient's forehead. As Terzic prepared to slice into the patient's scalp, he was asked if he'd ever seen this type of flaw in an artery, which occurs in just 2 to 3 percent of aneurysm cases. "On a video," Terzic replied with a chuckle. Terzic's hands-on experience shows why the nation's medical schools are beset by a nagging controversy over rules that limit the number of hours residents can work (Dan Browning, 10/8).