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An 88-year-old man presented with a colour change of his urine and constipation. One year earlier, he had undergone a left percutaneous nephrostomy for a urinary tract obstruction due to prostate cancer. A medical history revealed no pharmacological agent that could have caused the urine discolouration. On physical examination, the urine collecting bag and tube were dark purple (figure …
Contributors All the authors (JYO and H-JL) contributed to data collection, literature review, writing and approval.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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