Modified radical mastoidectomy is the treatment of choice for atticoantral or unsafe type of chronic suppurative otitis media. In successfully performed MRM the ear should go dry and provide almost a serviceable hearing level. Unfortunately this procedure fail in good percentage of cases and surgery has to be repeated in order to achieve the objective of dry ear with serviceable hearing. This study shows the incidence of revision surgery in modified radical mastoidectomy and identified the cause/causes of its failure and the management in 100 cases of MRM.