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Percutaneous Transvenous Mitral Commissurotomy (PTMC) is the preferred treatment for isolated rheumatic valvular mitral stenosis if the valve has suitable anatomy. Following transseptal puncture, entry into left ventricle is the crucial step. This may be difficult in patients with large left atrium and very severe mitral stenosis. We are reporting a case of 23-year-old female suffering from mitral stenosis in which the mitral valve could not be crossed with standard technique, so a novel “over the wire technique” was used to cross the mitral valve and successful valvotomy was performed without any complication.