Histologically confirmed upper gastrointestinal Crohn's disease: is it rare or are we just not searching hard enough?

Background/aims: Crohn's disease (CD) may involve the upper parts of the gastrointestinal (GI) tract including the esophagus, stomach, and duodenum. Clinical features of upper GI CD (UGICD) are not well characterized in the Gulf region. We therefore aimed to assess the prevalence and clinical characteristics of patients diagnosed with UGICD.