Gastric hemorrhage due to ruptured arteriovenous malformation (Dieulafoy's disease).

Dieulafoy's disease is one of the less common causes of significant hematemesis and/or melena. It occurs most frequently in middle-aged and elderly males, but both sexes and all ages may be affected. Histopathologically the lesion found is variable but includes the classical single large tortuous artery as well as thin-walled venous anomalies, and mixtures of these two. We present 4 cases of this condition.