by Victor Istasy MD, FRCPC; Tim Lynch MD, FRCPC; Rodrick Lim, MD, FRCPC –

A healthy, four month-old female infant presented to a local emergency department with a 12-hour history of decreased activity, non-bilious vomiting and one episode of dark red blood in the stools. There was no history of fever. Telephone consultation was completed and the patient was transferred to a tertiary, pediatric centre for further evaluation. On arrival, the infant appeared pale and was lethargic during the exam.