Two cases of Dieulafoy's lesion in unusual sites: A rare case reports of gastrointestinal bleeding

Introduction: Dieulafoy's lesion (DL) is a vascular malformation that can lead to massive gastrointestinal bleeding. It's usually found in the stomach. However, DL's occurrence in atypical sites such as the small bowel and colon is exceptionally rare, posing significant management challenges. Case presentation: In this report, we present two cases of DL occurring in uncommon sites, each managed with distinct approaches. Case 1 is a 50-year-old man admitted to the emergency department due to massive GI bleeding and hemodynamic instability. The diagnosis of DL was established through computed tomography angiography and confirmed by histopathological examination after emergency surgery. Case 2 involves a 68-year-old woman presented with melena due to a colonic DL. This case was successfully managed through an endoscopic hemostasis approach. Discussion: Dieulafoy's lesions (DL) were first identified as a large submucosal artery lacking typical gastric ulcer characteristics in three of Paul Georges Dieulafoy's patients. This lesion is responsible for approximately 1-2 % of all cases of gastrointestinal bleeding. Endoscopy is the preferred method for diagnosing and managing DL lesions, especially in cases of active bleeding that is accessible. However, if endoscopic treatment or angiographic embolization fails, a surgical approach may be needed. Conclusion: DL presents a diagnostic challenge due to its rarity and is not usually included in the differential diagnosis of gastrointestinal bleeding, particularly when occurring in unusual sites. Endoscopy is the preferred method to identify DL and a possible therapeutic approach in active bleeding. However, if endoscopy hemostasis fails, angiographic embolization or surgical intervention may be required.