A medical imaging technique that takes photographs of the inside of the bladder using a camera passed through the urethra.
From Greek 'kystis' (bladder) + 'photos' (light) + 'graphia' (writing/recording). Combines the bladder term with photography, emerging in the late 19th century as medical imaging technology advanced.
This was one of the earliest ways doctors could literally see inside a living patient's bladder without surgery—before modern ultrasound and CT scans, photography through a tube was cutting-edge medicine!
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