Delayed complication of balloon mitral commisurrotomy. a rare case scenario.

The last two decades has seen percutaneous transmitral commissurotomy turn out to be the standard of care in most patients with symptomatic mitral stenosis with a large body of evidence reporting excellent outcome on the short- and long-term with low incidence of serious complications. Complications necessitating urgent surgery are rare and include acute severe mitral regurgitation from mitral valve tear and cardiac tamponade due to cardiac chamber perforation. We report a rare extracardiac bleeding complication of balloon valvotomy presenting a month after the procedure with severe symptoms and mediastinal shift warranting emergency redo sternotomy and mediastinal thrombectomy.