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Crohn disease

(Science: radiology) CT: double halo (50%): edematous mucosa/thickened soft tissue, creeping fat (40%): mesenteric infiltration, ultrasound: thickened bowel wall (65%): about 8mm, inflammatory mass (14%), abscess (4%), distended fluid filled loops (12%), Complications: fistula (33%), intramural sinus tracts, abscess, perforations (rare), toxic megacolon, SBO (15%), hydronephrosis (usually right sided), adenocarcinoma in ileum/colon, differential diagnosis: Yersinia: in ti, resolution in 3-4 months, tb (more severe involvement of caecum), segmental infarction (acute onset, elderly patient), radiation ileitis, lymphoma, carcinoid, eosinophilic gastoenteritis, potassium stricture see: sites, phases, extraintestinal manifestations Cf: ulcerative colitis More info: crohn disease