Joseph Jacob, MD (photo by Jim Howe) Joseph Jacob, MD (photo by Jim Howe) A new method of looking into the bladder allows doctors to better spot cancers that may have previously gone undetected. Upstate urologist A new method of looking into the bladder allows doctors to better spot cancers that may have previously gone undetected. Upstate urologist Joseph Jacob, MD Joseph Jacob, MD, explains how bladder tumors can be diagnosed using "blue light cystoscopy" in conjunction with traditional white light cystoscopy -- the insertion of a thin, lighted tube into the bladder to allow examination. He also discusses bladder cancer, which is most often diagnosed in people in their 70s, and its treatment. The primary early symptom of bladder cancer is blood in the urine., explains how bladder tumors can be diagnosed using "blue light cystoscopy" in conjunction with traditional white light cystoscopy -- the insertion of a thin, lighted tube into the bladder to allow examination. He also discusses bladder cancer, which is most often diagnosed in people in their 70s, and its treatment. The primary early symptom of bladder cancer is blood in the urine.