A 3 yо mаle is brоught tо the Emergency Room by his pаrents becаuse he woke up in the middle of the night with difficulty breathing and a cough that sounds like a seal. On examination the child has a fever, harsh barking cough, a respiratory rate of 38/minute, and minimal stridor on agitation. There are no rales, or wheezes on lung auscultation. Despite your knowledge of the clinicial diagnosis, your supervising physician insists on ordering an xray. The xray image is depicted below. What xray finding woud you expect to confirm your already suspected diagnosis?