A 83-year-old man with a history of arterial hypertension, diabetes mellitus, chronic obstructive pulmonary disease, and benign prostatic hyperplasia was admitted to our center for a surgical repair of abdominal hernia. He was on a long-term urinary catheter. The surgical procedure was performed without immediate complications. 48h after the procedure, the urine bag showed a very distinctive purple color (Fig. 1). The patient remained clinical and hemodynamically stable without urinary symptoms; he complained of mild abdominal pain in the area of the surgical incision.