Diameter of Jejunum vs Ileum

[Brucelaa67]

---

Members don't see this ad.

Theres a question in Uworld, where a gallstone >2.5cm has occluded ileum.
Few sources say jejunum has less diameter compared to ileum. Jejunum | Radiology Reference Article | Radiopaedia.org Wiki says Ileum is lesser in diameter.
I know very silly, but any help?

 

[deleted103644]

It's not just ileum, but specifically terminal ileum (which usually has less diameter) or the ileocecal valve stopping the stone.

 

[Bounce!]

I was taught that the calibre is greatest in the second part of the duodenum and it decreases with length. Considering that ileuses mostly occur in, well, the ileum, this seems to fit with the facts. A quick consultation of Gray's Anatomy confirms this, with the jejunum being 2.5cm diametrically on average, the ileum 2cm, and the terminal just shy of that at 1.9cm.

Radiopaedia appears to be talking about the wall thickness, not the calibre. However, the ileum definitely doesn't have a bigger lumen.