The patient was a 76-year-old man with stage IVB cT3N1M1b right upper lobe lung adenocarcinoma. He had been treated with carboplatin + nab-paclitaxel therapy since January of year X, but due to disease progression, pembrolizumab monotherapy was initiated. After completing five courses of monotherapy, he developed immune-related adverse events called autoimmune pancreatitis and bile duct stricture, so prednisolone therapy was administered. In mid-September of year X, the patient complained of right lower abdominal pain and fever. He was diagnosed as a liver abscess and treated with antibiotics, but intraperitoneal bleeding occurred due to the rupture of the liver abscess. Embolization was performed on the pseudoaneurysm to stop the bleeding from the right hepatic artery, and the patient survived.

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