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Fig. 2A —62-year-old man with incidentally detected diverticulum. MRI small-bowel follow-through shows diverticulum arising from descending (second) duodenal segment (black arrows) and direct continuity with duodenal wall (white arrow, B) and lumen. Presence of wide neck facilitates inflow of ingested polyethylene glycol contrast material. Air–fluid level is seen on axial view (B).