An 8-month-old manifests fussiness and emesis and refuses to eat. At presentation to the hospital on the second day of admission, he is difficult to arouse. Vital signs are normal, there is abdominal distention, and the rectal examination reveals occult blood in the stool. The most likely diagnosis is

An 8-month-old manifests fussiness and emesis and refuses to eat. At presentation to the hospital on the second day of admission, he is difficult to arouse. Vital signs are normal, there is abdominal distention, and the rectal examination reveals occult blood in the stool. The most likely diagnosis is

Complications of appendicitis include all of the following EXCEPT

The most common cause of facial swelling without facial tenderness or erythema in the maxillary area of a 12-year-old is

The anorectal defect most frequently encountered in male patients is

Potential causes of constipation include all of the following EXCEPT