[Rupture of Tuberculous Infective Abdominal Aortic Aneurysm after Intravesical Bacillus Calmette-Guérin Instillation Therapy].

The patient was a 74-year-old male who had undergone intravesical Bacillus Calmette-Guérin(BCG) instillation therapy for bladder cancer. He visited our hospital with chief complaints of fever and abdominal pain. Abdominal aortic aneurysmal rupture and iliopsoas muscle abscess were confirmed by computed tomography( CT). We performed semi-emergency surgery, including replacement of the abdominal aorta with a synthetic graft, iliopsoas abscess debridement, and omentopexy. A rifampicin-bonded synthetic graft was used because of the possibility of tuberculous involvement after BCG instillation therapy. Examination of the tissues collected during surgery were positive for tuberculosis deoxyribonucleic acid (DNA) in a polymerase chain reaction (PCR), and showed multiple giant cell granulomas with caseous necrosis, which both strongly suggested involvement of tuberculosis. Therefore, 4 types of antituberculous drugs were administered for 40 days. This case shows that an infective aneurysm should be suspected when fever and abdominal pain develop after intravesical BCG instillation therapy.