topical application of mitomycin c in the treatment of granulation tissue after canal wall down mastoidectomy

introduction: otorrhea and granulation tissue in canal wall down mastoidectomy (cwd) is the common problem in cholesteatoma removal and leads to many discomfort for both the patient and the physician. the main objective in cwd is creating the dry cavity, so the topical antibiotic and acetic acid in variable saturations are used for this purpose. in this study we evaluate the effectiveness of topical mmc and chemical cautery by acetic acid.   materials and methods: study population consists of 50 patients with cholesteatoma whom underwent cwd. all patient allocated randomly in two study groups, mmc and acetic acid. after 3 weeks, the first visit is planned, extension of granulation tissue and dryness of cavity are evaluated and topical drugs are used in blind fashion. mmc in 4% and acetic acid in 12.5% saturation are applied. other visits are completed at next month and 3 months later.   results: both methods are effective in treatment of granulation tissue. in each group both treatment were effective too but mmc was more effective than acid acetic in the treatment of granulation tissue after 4 weeks.   conclusion: based on our findings, it is clear that topical mmc is very effective in the treatment of granulation tissue and in cwd. it results in dry cavity much better than acetic acid without any complication.