Abstract
Ureteropyeloscopy not only is of considerable diagnostic value but also is therapeutically useful. In particular, it is superior to all other procedures available for clarifying the nature of filling defects found at urography. When a ureteral tumor has been discovered, biopsy material can be obtained to determine whether the tumor is malignant before treatment is initiated. In suitable cases, endoscopic endoureteral electroresection can be performed as an alternative to open surgery.
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