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Purple discoloration of a urinary catheter bag is an uncommon phenomenon which is part of an entity known as purple urine bag syndrome (PUBS). It is usually associated with bacterial urinary infections caused by sulfatase/phosphatase producing bacteria and occurs predominantly in elderly women, individuals with multiple co-morbidities and chronically catheterized patients. The incidence of PUBS has increased in recent years, often becoming a cause for concern among caregivers. For this reason, it is importante to recognize its existence and promote prevention strategies. We hereby present a case report of this rare syndrome occurring in a 91-year-old man.