[Staining test with methylene blue during resection of bladder cancer in 30 patients].

From November 1991 to March 1993, staining test with methylene blue was applied in 30 patients with the bladder cancer during operation. Twelve patients (40%) showed positive results, and 27 specimens were obtained from the stained areas. Histological examination proved that they were carcinoma in situ (11), transitional cell carcinoma (7), squamous cell carcinoma (4), dysplasia (3), chronic cystitis (1), and normal mucosa (1). The positive rate of histological results was 96.3%. 21 specimens from the unstained areas showed negative results. Six (33%) of 18 patients with single tumor and 6 (50%) of 12 patients with multiple tumor were positively stained. Follow-up from 10 to 26 months showed one patient (3.3%) had recurrence after 8 months.