Aberrant Right Subclavian Artery Complicated by Acquired Hemophilia A and a Subclavian Artery-Esophageal Fistula after Traumatic Injury.

An aberrant right subclavian artery (ARSA) is a rare developmental anomaly wherein the right subclavian artery arises from the descending aorta as a fourth branch of the aortic arch. We present the case of ARSA in an 81-year-old woman who was injured in a motorcycle accident. The patient had a history of asymptomatic cerebral infarction, type 2 diabetes mellitus, and rheumatoid arthritis. She was diagnosed with spleen and liver injury, left renal injury, along with fractures in the rib, pelvic, vertebrae, and right tibia. On the 3^rd hospitalization day, activated partial thromboplastin time (APTT) prolongation was observed, followed by sudden massive hematemesis and shock on the 39^th day. We indicate sudden hematemesis and ARSA bleeding as the cause. We performed compression with a Sengstaken-Blakemore tube and coil embolization for hemostasis. Our findings show that the bleeding was mainly caused by nasogastric tube compression, prolonged APTT, and acquired hemophilia A.