Croup: Anteroposterior radiograph with "steeple sign"

The anteroposterior (AP) view demonstrates tapering of the upper trachea, known as the "steeple sign" of croup. Note that the finding can be simulated by differing phases of respiration even in normal children.

Courtesy of the Department of Diagnostic Imaging, Texas Children's Hospital.

Graphic 52418 Version 2.0

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