Differentiation Between Ulcerative Colitis and Crohn's Disease Using Abdominal Computed Tomography in Patients With...

Area of Science:

• Radiology
• Gastroenterology
• Medical Imaging

Background:

• Ulcerative colitis (UC) and Crohn's disease (CD) are distinct types of inflammatory bowel diseases (IBDs).
• Accurate differentiation between UC and CD is crucial due to differing pathogeneses and treatment strategies.
• Current diagnostic methods can be invasive or complex.

Purpose of the Study:

• To assess the feasibility of distinguishing between UC and CD in newly diagnosed IBD patients.
• To utilize simple abdominal computed tomography (CT) findings for differentiation.
• To identify specific CT-based markers that can aid in diagnosis.

Main Methods:

• Retrospective study of 43 patients with first-time IBD diagnosis (January-December 2021).
• Analysis of demographic data, laboratory markers (WBC, albumin, CRP), and abdominal CT-derived measurements (visceral fat area, subcutaneous fat area, psoas major volume).
• Statistical analysis including Receiver Operating Characteristic (ROC) curve analysis to determine diagnostic accuracy.

Main Results:

• Significant differences observed in visceral fat area (51.80 cm² for UC vs. 21.10 cm² for CD, p < 0.01) and subcutaneous fat area (108.30 cm² for UC vs. 66.30 cm² for CD, p = 0.049).
• Total protein concentration also differed between groups (6.15 g/L for UC vs. 6.60 g/L for CD, p = 0.012).
• ROC analysis indicated potential for differentiating UC and CD using fat measurements, with specific cutoffs identified.

Conclusions:

• Simple abdominal CT-derived visceral and subcutaneous fat areas are feasible markers for differentiating UC from CD in treatment-naïve IBD patients.
• These imaging parameters offer a non-invasive approach to support differential diagnosis in early IBD.
• Further validation in larger cohorts is recommended to solidify the clinical utility of these findings.