S2193 Splenic Artery Collaterals Masquerading as Gastric Varices: An Uncommon Cause of Massive Upper GI Bleed

Abstract

INTRODUCTION: Upper gastrointestinal bleeding (UGIB) is most commonly due to peptic ulcer disease (PUD). However in patients with splenic artery thrombosis, collateral arterial vessels can develop. If these abnormal vessels erode into the stomach mucosa, massive UGIB can occur. Here we present a case of UGIB from submucosal splenic collateral arteries. CASE DESCRIPTION/METHODS: A 56 year old male with history of Factor 5 Leiden and antiphospholipid antibody syndrome (APLS) presented with melena and hematemesis. Esophagogastroduodenoscopy (EGD) showed possible gastric varices in the fundus with an area of ulceration (Figure 1). The patient’s prior history of heavy alcohol use and the presence of a nodular liver on CT scan suggested underlying cirrhosis and portal hypertension as the etiology for the gastric varices. However the patient was found to have a low hepatic venous pressure gradient (2 mmHg) and a subsequent liver biopsy did not reveal cirrhosis. The splenic vein was also noted to be patent on CT scan. Several days after admission, the patient experienced another episode of hematemesis with associated hypotension and tachycardia. CT angiogram at the time did not reveal any active bleeding, but did show a splenic artery thrombosis with several collateral vessels. Subsequent angiogram demonstrated large arterial collaterals in the gastric fundus with outflow to the spleen, bypassing the occluded splenic artery (Figure 2). These collateral vessels were embolized successfully and he had no further bleeding. DISCUSSION: This case highlights the importance of multidisciplinary patient care and careful assessment of a patient’s medical history and anatomy to accurately diagnose and treat underlying pathology. While our patient was thought to have varices on EGD, he did not have cirrhosis, splenic vein thrombosis or portal hypertension which made the diagnosis of gastric varices unlikely. However, he did have a splenic artery thrombosis due to underlying APLS which led to the formation of submucosal gastric arterial collateral vessels and UGIB. Submucosal arterial collateral vessels are a rare cause of UGIB and there are only a few cases described in the literature. They can form as a result of splenic artery thrombosis due to underlying coagulopathy, pancreatitis, abdominal trauma or congenital absence of the splenic artery. If these abnormal collateral vessels erode through the stomach mucosa, they can lead to UGIB. Treatment involves surgery (partial gastrectomy and splenectomy) or embolization.Figure 1.: Possible gastric varix in the stomach fundus with an area of ulceration seen on EGD.Figure 2.: Angiogram demonstrating large arterial collaterals in the gastric fundus with outflow to the spleen, bypassing an occluded splenic artery.