Fig. 11

A 76-year-old male patient with anaemia and rectal blood loss. MR enteroclysis (a) coronal fat-saturated true-FISP image demonstrates a small bowel lesion (black arrow), causing small bowel wall kinking—the ‘hair pin’ sign (open arrow). The sign was also seen in other sequences, differentiating it from bowel motility. (b) Axial fat-saturated VIBE image after intravenous contrast medium administration demonstrates that the lesion (white arrow) moderately enhances. A neuroendocrine tumour may be suspected on MRI; the diagnosis was confirmed on histopathology