What causes Dieulafoy's lesion?

Dieulafoy’s lesion is caused by a small, abnormally large artery located close to the surface of the stomach or intestinal mucosa, which can lead to significant gastrointestinal bleeding. The exact etiology is not completely understood, but it is believed to be associated with factors such as mucosal erosion, ulceration, or inflammation. This lesion is often idiopathic, meaning it can occur without a clear underlying cause. Diagnosis typically involves endoscopy, where the lesion can be identified and treated.