Atrial myxoma mimicking a collagen disorder.

A 14-year-old boy had a protracted illness characterized by bilateral tenderness and weakness of the extremities; the illness was considered to be a connective tissue disease similar to polymyositis. Not until nine months later, when the patient had new cardiac murmurs, pulmonary edema, and then a cerebrovascular accident, was the true nature of his illness suspected. The diagnosis of left atrial myxoma with the triad of constitutional, obstructive, and embolic effects was confirmed by echocardiographic studies and cardiac catheterization. The tumor was successfully removed.