The lateral radiograph of neck in laryngo-tracheo-bronchitis (croup).

The films of 61 children who had a lateral radiograph of neck performed in the management of acute laryngo-tracheo-bronchitis were reviewed by a paediatric radiologist. He was unaware of the clinical history and the outcome of the children's illnesses. The clinical records of the same children were reviewed independently and information sought about the clinical relevance of the film results. Sixty per cent of the films were felt to be in keeping with a diagnosis of acute laryngo-tracheo-bronchitis. As judged by the information in the medical records these results did not influence the management of the children other than in one instance where a child underwent laryngoscopy. This decision was strongly influenced by the original film report. No child developed acute airway obstruction while in the Radiology Department. The findings of this study support the concept that a request for a lateral X-ray of neck in croup is an inefficient use of diagnostic facilities.