The vomiting infant: recent advances and unsettled issues in imaging.

The evaluation of infantile vomiting is bound up with many unresolved questions and continually evolving imaging technologies. This article addresses three specific areas of interest: the use of newer low-osmolality, water-soluble contrast media in the infant's gastrointestinal tract; the ever-controversial subject of gastroesophageal reflux; and the burgeoning role of gastrointestinal ultrasonography.