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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: J Allergy Clin Immunol Pract. 2015 Mar 29;3(4):585–591. doi: 10.1016/j.jaip.2015.01.026

Fig. 4.

Fig. 4

Fig. 4

Fig. 4a. Absent thymic shadow for a patient with SCID. No thymic shadow in the cardiomediastinal contour is evident on the radiographic image

Fig 4b. Present thymic shadow for a normal infant. A thymic shadow or “sail sign” is present in the right cardiomediastinal contour.