A 22-year-old female with mirror image dextrocardia and rheumatic valvular mitral stenosis underwent closed mitral valvotomy using a Tubb's dilator with good results. Despite abnormal position of situs, the surgical approach was simple through right anterolateral thoracotomy, and the operator's hands were mirror image to that of levocardia valvotomy in certain steps. Preoperative mitral valve area was 0.8 cm2, and peak and mean diastolic gradients were 21 and 15 mmHg respectively. Postoperatively, valve area improved to 2.16 cm2, and peak and mean diastolic gradients were 8 and 3.1 mmHg, respectively.
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