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The diagnosis of atrial myxomas. Difficulties and pitfalls.

Altogether seven patients with the preoperative diagnosis of atrial myxoma were admitted to our hospital in 1968-78 and referred for surgery. In two patients no tumour was found at operation. In one of them the reason for the misinterpretation was severely malformed mitral leaflets. In the other the contrast medium was injected into a pulmonary vein, which caused a contrast defect due to inadequate mixing.