
Non-muscle-invasive bladder cancer (NMIBC), the most common form of bladder cancer, is typically associated with a variable risk of recurrence and progression. However, a rare condition known as metastatic NMIBC occurs when patients develop metastases without evidence of muscle-invasive disease in the bladder. The phenomenon is poorly understood and has been mainly described in case reports and small reviews. Potential contributing factors include tumour understaging, multiple transurethral resection procedures, the presence of circulating tumour cells, diagnostic methods used in cystoscopy, and possible gender differences. This perspective synthesizes available data on metastatic NMIBC and offers insights into its possible aetiologies, shedding light on a complex and under-explored aspect of bladder cancer.
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