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Sagittal greyscale US (a) in a 13-year-old female: ileocolic Crohn’s disease. Bowel wall thickening with modification of normal stratification. Sagittal colour Doppler (b), axial power Doppler (c) plane: active Crohn’s disease. Increased vascularity in the thickened bowel wall segments. Sagittal colour Doppler image (d) of the left colon in a 15-year-old male with UC shows thickened and moderately hyperaemic bowel wall segment with preservation of normal stratification
