A 69-year-old man was admitted to our hospital with abdominal pain, fever and massive bloody stool for the last 3 days, but no pathergy, genital and oral ulcers. Blood pressure was 86/54 mm Hg, respiratory rate 24 breaths/min, heart rate 126 beats/min. Subsequent laboratory findings were as follows: white blood cells 10.06×109/L, C reactive protein 47.5 mg/L, albumin 28.2 g/L and haemoglobin 77 g/L. HLA-B51 was positive. The abdominal contrast-enhanced CT scan revealed the presence of strip-like high-density shadows in the ileocecal region (figure 1A). Emergency surgery was performed. Intraoperative exploration from the cut ileum revealed multiple ulcers in some parts of the ileum (figure 1B). The patient underwent resection of about 20 cm of …