Radiology: IBD and Cancers Flashcards
In intussusception, which is the intussusceptum, and which is the intussuscipiens?
intussusceptum: the part that goes in
intussuscipiens: receives the invaginating part.
What is a flat colon, without haustrations, with some tiny granulations (ulcers) on Ba suggestive of?
Ulcerative colitis
An annular lesion with shelf-like margins is probably…
an adenocarcinoma.
What’s an apthoid ulcer? Which form of IBD is it suggestive of?
Ulcer surrounded by a radiolucent mound of edema.
More consistent with CD -as these are from ulcers arising on background of normal mucosa.
What are linear ulcers on the mesenteric border pathognomonic for?
CD
How does celiac disease affect the appearance of the valvulae coniventes?
They may be absent.
How does ischemia affect the appearance of the valvulae coniventes?
They may be thickened - “thumb printing”
Why does the lumen have to be very narrow for one to get symptoms from a small intestine adenoma / carcinoma?
At that point, the material is liquidy, and can get through a small lumen pretty easily.
What cell do carcinoid tumors arise from?
APUD cells in the basal layer of the submucosa. (in the distal ileum)
What is desmoplastic action?
Bowel being pulled at the edges by a carcinoid tumor.
What, related to carcinoid tumors, can be seen on CT?
mesenteric metastases
What’s the most common region for small bowel lymphoma?
The ileo-cecal region. (where the most lymphoid tissue is)
What effect do lymphomas have on the gut lumen?
They often thicken the gut wall without narrowing the lumen.
What is myochosis?
Shortening and thickening of the colon in diverticulosis.
What do asymmetric damage to the mucosa in diverticulitis result in?
Bleeding into the lumen, not the peritoneum.
