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NBME 22 Answers
A 28-year-old man comes to the emergency department ...
The picture is key here. You’re right that ileocecal is most common, but ileo-ileal and jejuno-jejunal are the next most common (I think I might just know this from having done clerkships already, not sure). Ileo-ileal isn’t an answer, so that rules that out. Look at where the arrows are pointing in the picture as well. Its on the L, ruling out appendix and cecum. And the slice is not at the level of the duodenum, ruling out that answer. So by process of elimination based on the picture you could get this one too.
I think the small intestine narrows as you go along, so jejunum would most likely intuss into the duodenum.
Duodenum is fixed to the retroperitoneal wall, and also has lots of named vessels attached to it, along with the pancreaticobiliary duct and ampulla. It cant really intussuscept.
You should also know that the duodenum is almost purely on the right side of the body