Histiocytoid cardiomyopathy presenting with Wolff-Parkinson-White syndrome

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Figure 1  .

(Left) Histiocytoid cells within the myocardium showing large round myocytes with smooth borders, granular and eosinophilic cytoplasm, and small irregular nuclei. (Right) Subendocardial nodule (0.5 cm) on the atrial aspect of the tricuspid valve.