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Young child following URI with TCP is pretty classic ITP. Sometimes they throw in extra stuff on purpose, but I didn’t see much on the bone marrow aspirate either.
I was also thinking ITP but the bone marrow image kind of threw me off too, not sure what I'm supposed to see but still think ITP is best choice ...
It also almost threw me off, but then I remembered he had low platelet count and I guessed those multinucleated cells were Megakaryocytes (I looked for Megakaryocyte Bone Marrow Biopsy in google and they are the same).
Bone marrow shows increased megakaryocytes -> ITP
Small intestine has smooth muscle in the walls which will fibrose on injury
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)
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