In radiology, the steeple sign is a radiologic sign found on a frontal neck radiograph where subglottic tracheal narrowing produces the shape of a church steeple within the trachea itself. The presence of the steeple sign supports a diagnosis of croup, usually caused by paramyxoviruses.
In the context of radiology, the steeple sign refers to a particular shape observed in frontal neck X-rays, characterized by a narrow section of the trachea that resembles a church steeple. This sign is often used as evidence to support a diagnosis of croup, typically caused by paramyxoviruses.