A 16-year-old boy is gripped with sudden abdominal pain at school and starts throwing up. The pain is initially central around the umbilicus without any radiation then becomes more vaguely centered in the right lower abdomen. He is brought to the ER where his vitals are: temperature 101.1 F, BP 110/72 mm Hg, pulse 106/min, and SPO2 92%. Chest is clear and abdominal exam reveals tenderness in the right lower quadrant with rebound and hypoactive bowel sounds. Labs show HB of 14g/dl, WBC 15500, and platelets 420,000/uL. Obstructive series shows non specific bowel dilatation. CT scan of the abdomen is ordered. What is the likely diagnosis?
A) Acute gastroenteritis.
B) Acute cholecystitis.
C) Acute appendicitis.
D) Acute diverticulitis.
E) Incarcerated hernia.
