The distinction between a sound cardiologist and an excellent cardiologist is the ability of the latter to recognize and diagnose the unusual. In this issue, a group of experts reviews a spectrum of unusual cardiomyopathies, any or all of which may present to the general cardiologist. Myocarditis, reviewed by Blauwet and Cooper, runs the gamut of severity from mild to life-threatening and may mimic a whole spectrum of cardiovascular disease. Although the classic presentation with acute onset heart failure, electrocardiographic changes, and arrhythmia suggests an immediately apparent diagnosis, the authors clearly describe the more subtle ways in which myocarditis may present, as well as the difficulties in precisely defining a diagnosis.

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Each issue of Progress in Cardiovascular Diseases comprehensively covers a single topic in the understanding and treatment of disorders of the heart and circulation. Some issues include special articles, definitive reviews that capture the state of the art in the management of particular clinical problems in cardiology.