IBD IBD Diagnosis and Imaging 3

Question 1

Which colonoscopic finding most reliably distinguishes UC from Crohn's colitis?

Accepted Answer

Involvement of the rectum with continuous proximal extension (UC) vs. rectal sparing with skip lesions (Crohn's)

Answer

Presence of ulcers

Answer

Presence of pseudopolyps

Answer

Mucosal erythema

Question 2

The Simple Clinical Colitis Activity Index (SCCAI) is used to assess disease activity in which condition?

Accepted Answer

Ulcerative colitis

Answer

Crohn's disease of the small bowel

Answer

Pouchitis post-IPAA

Answer

Microscopic colitis

Question 3

Elevated fecal calprotectin (>250 µg/g) in an asymptomatic IBD patient in clinical remission most likely indicates what?

Accepted Answer

Subclinical mucosal inflammation despite symptomatic remission

Answer

Lab error requiring repeat testing

Answer

Normal finding in remission

Answer

Colorectal cancer

Question 4

On CT scan, which finding is most specific for an IBD-related entero-enteric or entero-vesical fistula in Crohn's disease?

Accepted Answer

Air in the bladder (pneumaturia) without instrumentation

Answer

Wall thickening of a single bowel loop

Answer

Mesenteric fat stranding

Answer

Lymphadenopathy

Question 5

Which test is recommended to exclude infection before initiating or escalating immunosuppressive therapy in IBD?

Accepted Answer

Stool culture and Clostridioides difficile toxin testing

Answer

Fecal elastase

Answer

Hydrogen breath test

Answer

Fecal fat quantification

Question 6

MR enterography is preferred over CT enterography for pediatric and young IBD patients primarily because of which advantage?

Accepted Answer

No ionizing radiation exposure

Answer

Lower cost and faster acquisition

Answer

Better visualization of mucosal detail

Answer

Does not require oral contrast