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. 2015 Mar 2;48(1):273–280. doi: 10.4143/crt.2014.190

Fig. 1.

Fig. 1.

False-positive and true-positive cases using narrow band imaging (NBI) cystoscope. White light cystoscopy (WLC) (A; counted as negative) and NBI (B; counted as positive) cystoscopic finding of 64-year-old male who was priorly treated with transurethral resection of bladder for urothelial carcinoma of Ta, low grade. He finished his bacillus Calmette–Guérin (BCG) instillation 9 weeks before cystoscopy, and histologic examination revealed chronic inflammation. WLC (C; counted as positive) and NBI (D; counted as positive) cystoscopic finding of 53-year-old male who was treated with prior transurethral resection of bladder for urothelial carcinoma of T1, low grade. He finished his last BCG instillation 8 months prior, and histologic exanimation found Ta, papillary urothelial carcinoma with low malignant potential.