Darrell Cass, M.D. (image) Cleveland Clinic Share Print E-Mail Caption Darrell Cass, M.D., performs an in utero surgery to repair a spina bifida birth defect in a nearly 23-week-old fetus. Credit Cleveland Clinic Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.