Chest radiograph of a child with pneumomediastinum

In this radiograph of a child with pneumomediastinum, the following characteristic signs are seen:

The "continuous diaphragm sign," in which the mediastinal gas is seen as a thin lucent line outlining the superior surface of the diaphragm and separating it from the heart (white arrows).
"Naclerio's V sign," in which the gas outlines the lateral margin of the descending aorta and extends laterally over left hemidiaphragm (black arrows).

Courtesy of Ibrahim Janahi, MD, and Ammar Alishlash, MD, FAAP.

Graphic 60290 Version 5.0

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