Updating magnetic resonance imaging of small bowel: Imaging protocols and clinical indications

Figure 1 A 36-year-old man with Crohn's disease, the small bowel thickness exceeds 4-5 mm on T2W image, and stratified appearance (so-called "target" or "double halo" appearance) can be seen.

Figure 2 A 25-year-old man with Crohn's disease and inflammation of ileocecal junction. T2W image shows "double halo" appearance (arrows) of thickened (8 mm) bowel wall.

Figure 3 A 42-year-old man with Crohn's disease, T2W image shows skip lesions of ileum with thickened (7 mm) bowel wall.

Figure 4 A 36-year-old woman with Crohn's disease, the bowel wall of the involved segment has a homogeneous enhancement at CE-T1W image. And the “comb sign” also can be seen.

Figure 5 A: A 68-year-old man with adenocarcinomas, T2W image shows the tumor with similar signal intensity, the proximate jejunum dilating conspicuously; B: The same patient, tumor shows heterogeneous enhancement greater than adjacent bowel on gadolinium-enhanced image.