NBME 23 Answers : Block 2 : #30 = A 21-year-old man is brought to the emergency ...

NBME 23 Answers

nbme23/Block 2/Question#30

A 21-year-old man is brought to the emergency ...

Liver

+1 upvote downvote
submitted by youssefa(58),

So cutting through the intestine will damage the crypts of Lieberkühn which contain stem cells that replace enterocytes/goblet cells (Faid). This lack of regenerative ability will have platelets and inflammatory cells to be recruited in order to mediate healing (which end result is fibrosis) The intestinal wall lacking crypts of Lieberkühn acts pretty much like stable cells (e.g: cardiomyocytes) which cannot be regenerated and so fibrosis ensues (e.g: Scar is always end product after MI).

youssefa Correction: I meant Permanent cells instead of Stable cells. The hepatocytes in this case will act as a stable cells which will exit G0 phase and proliferate in response to injury. +

+0 upvote downvote
submitted by et-tu-bromocriptine(59),

Anyone know how to rule out small intestine on this one? I thought the omentum played a role in healing in the abdomen, but clearly I'm missing something here.

what Small intestine has smooth muscle in the walls which will fibrose on injury +

youssefa So cutting through the intestine will damage the crypts of Lieberkühn which contain stem cells that replace enterocytes/goblet cells (Faid). This lack of regenerative ability will have platelets and inflammatory cells to be recruited in order to mediate healing (which end result is fibrosis) The intestinal wall lacking crypts of Lieberkühn acts pretty much like stable cells (e.g: cardiomyocytes) which cannot be regenerated and so fibrosis ensues (e.g: Scar is always end product after MI) +1

thotcandy The way i thought of it was: small intestine PERFORATION repair -> the basement membrane and stem cells were definitely disrupted thus limiting regeneration ability Liver = puncture wound, not necessarily all the way through = basement membranes and stem cells are probably still intact -> regenerate without fibrosis +

-2 upvote downvote
submitted by bigbootycorgi(3),

So I got this one wrong because I thought that since he didn't have hepatosplenomegaly and ascites his liver was still fine, but I guess if he already has gynecomastia, hypogonadism and the ever obvious spider angiomata he's definitely still ok

Now that I think of it, you don't need hepatosplenomegaly to have alcoholic liver failure I believe.

bigbootycorgi sorry my bad this was the wrong question i responded to but i still got this one (ED one) and the gynecomastia one wrong i think it's liver for this one because they say it has regenerative potential and because even though the small intestine has regenerative potential, it can apparently fibrose? i have no idea, i put small bowel +

kateinwonderland @bigbootycorgi : I put small intestine too. From what I've searched after, it says that liver fibrosis reversible -> no evidence of fibrous scarring +

goodkarmaonly Just to add to that, a cirrhotic liver is a small shrunken liver so you wont be able to find hepatomegaly anyways. The other signs are the stigmata of Liver disease +