An 11-year-old Tanner stage 2 female experiences intermittent periumbilical abdominal pain 2 days before emergently visiting her pediatrician. Six hours later, she is nauseated and has one or two episodes of emesis. She also has had two soft bowel movements without blood or relief of symptoms. She walks cautiously into your office and lies still on your examining table. When you begin your examination, she is apprehensive and watches every move of your examining hand. You notice guarding and tenderness throughout her abdomen; the most tender area is the right lower quadrant. The most likely diagnosis is

An 11-year-old Tanner stage 2 female experiences intermittent periumbilical abdominal pain 2 days before emergently visiting her pediatrician. Six hours later, she is nauseated and has one or two episodes of emesis. She also has had two soft bowel movements without blood or relief of symptoms. She walks cautiously into your office and lies still on your examining table. When you begin your examination, she is apprehensive and watches every move of your examining hand. You notice guarding and tenderness throughout her abdomen; the most tender area is the right lower quadrant. The most likely diagnosis is

The following might reflect physical features associated with obesity in a 10-year-old boy, EXCEPT

The following are characteristic features of acute hypervitaminosis A EXCEPT

Thiamine-responsive megaloblastic anemia syndrome is characterized by the following EXCEPT

Pyridoxine is not affected in patients receiving