Chronic gastritis in a gastric diverticulum misdiagnosed as a left adrenal mass.

Gastric diverticula are rare and usually asymptomatic. They are most frequently located on the posterior wall of the stomach. Many of them were reported as adrenal masses. Here, we present a 48-year-old male with a gastric fundus diverticulum that was misdiagnosed as a left adrenal mass on magnetic resonance imaging (MRI). Laparoscopic resection of the diverticulum was successfully performed, and histopathological examination revealed a true gastric diverticulum with moderate chronic gastritis. Although most cases of gastric diverticula are asymptomatic, to the best of our knowledge, this is the first reported case of chronic gastritis that developed in a gastric diverticulum.