Malignant mesenchymoma of the heart presenting as mitral stenosis.

Malignant mesenchymoma of the left atrium obstructing the mitral orifice was revealed at autopsy in a 39-year-old woman with a history indicating mitral stenosis. Minor tumour nodules were found in the walls of the right and left ventricle together with a few distant metastases. Clinical findings in primary cardiac tumours and the rarity of primary malignant mesenchymoma of the heart are discussed.