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Normal thymus, 3-month-old male. A: Chest radiograph—there is widening of the superior mediastinum with a wavy left border typical of a thymic wave sign, present where the thymus is indented anteriorly by the ribs. B: Axial contrasted computerized tomography (CT)—the quadrilateral shape of the infant thymus and indentation of the left side of the thymus by a left anterior rib is demonstrated (arrow). C: Coronal reconstruction demonstrates the superior and inferior extent of the thymus, extending all the way down to the diaphragm adjacent to the right atrium (arrow). In addition, there is a small superior extension of the thymus into the left neck anteriorly (arrowhead); this is also a common normal variant. Source: Chapter 506. Tools for Diagnosis and Management of Respiratory Disease, Rudolph's Pediatrics, 22e Citation: Rudolph CD, Rudolph AM, Lister GE, First LR, Gershon AA. Rudolph's Pediatrics, 22e; 2011 Available at: http://mhmedical.com/ Accessed: June 11, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved
