Leonard E Swischuk1,2. 1. Department of Radiology, The University of Texas Medical Branch, Galveston, TX, 77555-0709, USA. lswischu@utmb.edu. 2. Department of Radiology and Pediatrics, The University of Texas Medical Branch, Galveston, TX, 77555-0709, USA. lswischu@utmb.edu.