A 4-Month-Old Boy Is Brought to the Office for "Noisy

A 4-month-old boy is brought to the office for "noisy breathing."  The patient's parents first noticed a harsh sound when he cried at age 2 weeks, but it has gotten louder over the past month, especially when he is lying on his back.  The noise seems to improve when the patient is held upright or during "tummy time."  He does not appear to have labored breathing and has never turned blue.  The patient has had occasional, small spit-ups after feeds but has been growing well along the 60th percentile for weight.  He was born at full term without complications during pregnancy or labor and delivery.  On physical examination, the patient has inspiratory stridor when he is supine that improves when he is prone.  The remainder of the examination is normal.  Which of the following would confirm the most likely diagnosis for this patient?

A) Chest radiography
B) CT scan of the neck
C) Flexible fiberoptic laryngoscopy
D) Fluoroscopic barium swallow
E) MR angiography of the neck
F) Plain radiograph of the neck

Correct Answer:

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