Clinical presentation

A 74-year-old Caucasian female presented with a 12 month history of non-bloody, culture-negative diarrhoea associated with weight loss of 10 kg. She denied any extragastrointestinal manifestations. She had previously undergone orthotopic liver transplantation for primary biliary cirrhosis 12 years ago. Her immunosuppression was mycophenolate mofetil 500 mg twice daily for the past 2 years. She had previously been on ciclosporin but this was discontinued due to renal impairment.

Baseline bloods revealed: haemoglobin 9.6 g/dl (mean corpuscular volume (MCV) 85 fl), C-reactive protein 76 mg/l and normal renal and liver biochemistry. She was euthyroid, and coeliac serology was negative. Colonoscopy demonstrated moderate, patchy mucosal inflammation predominantly affecting the proximal colon (figure 1). Multiple biopsies were obtained.