Three cases of left atrial myxoma were studied by echocardiography. In one case the atrial tumour was prolapsing through the mitral orifice into the left ventricular cavity; in the other two cases it was not. The angiocardiographic and operative findings correlated well with those from echocardiography. A systematic echocardiographic study is important; the suprasternal approach is useful in the echocardiographic exploration of the left atriu, especially for nonprolapsing tumours.
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