Intravesical Bacillus Calmette–Guérin (BCG) therapy is primarily indicated for carcinoma in situ of the urinary bladder. Unfortunately, BCG-related infections possibly occur following bladder instillation, with reported incidence rates ranging from 0.98% to 4.3% [
1,
2]. This iatrogenic adverse event usually develops more than 3 months after the BCG instillation, with various manifestations [
3]. Among a range of systemic complications, vascular involvements are quite rare, accounting for 5.7% of documented BCG-related infections [
2]. Nevertheless, severe cases of BCG-infected aortic aneurysms have been described in the literature [
4‐
6]. We herein present another case of BCG-related psoas abscess with concurrent secondary infected aneurysm after intravesical BCG therapy. …
