MRCP2-1790
A 24-year-old man presented with a 4-week history of offensive-smelling, pale diarrhoea and abdominal cramps. He had recently returned from travelling in South America, New Zealand and Nepal, where he had two episodes of diarrhoea or vomiting which had self-resolved.
On examination, he had mild tenderness in the abdomen and soft brown stool on rectal examination. He was given a single dose of 2 g of tinidazole empirically, but two weeks later he presented with ongoing diarrhoea and was referred for further investigation. Investigations revealed duodenal villous atrophy and normal colonoscopy. Stool culture and microscopy showed no growth or parasites.
What is the most likely diagnosis?