[Answer] A previously healthy 25 year old man presents to the emergency department with progressive right lower quadrant abdominal pain over the last 24 hours. He reports no recent weight loss and no blood in his stool.His vital signs in the emergency department show:Temperature: 38.5C HR 110 RR 24 BP 110/70 SaO2 100% on room airOn physical examination he has severe tenderness to palpation in his right lower quadrant without significant tenderness in the remainder of his abdomen.Labs are remarkable for a WBC of 18 000 with 15% bandemiaA CT scan of his abdomen and pelvis shows a thickened appendix dilated to 1.5 cm with surrounding fat stranding.Which of the following is the most likely etiology for his symptoms? Peri-appendiceal abscess Crohn's disease Obstruction of the appendiceal lumen by a piece of stool Lymphoma involving the base of the appendix Cecal cancer that includes the appendiceal orifice.

Answer: Obstruction of the appendiceal lumen by a piece of stool

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A previously healthy 25 year old man presents to the emergency department with progressive right lower quadrant abdominal pain over the last 24 hours. He reports no recent weight loss and no blood in his stool.His vital signs in the emergency department show:Temperature: 38.5C HR 110 RR 24 BP 110/70 SaO2 100% on room airOn physical examination he has severe tenderness to palpation in his right lower quadrant without significant tenderness in the remai...

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