Abstract
A 43-year-old female with a history of hypereosinophilia developed acutely decompensated heart failure. Prototypical features of eosinophilic myocarditis, including a distinctive left ventricular mass and severe mitral regurgitation, were identified on a transthoracic echocardiogram. The patient's eosinophilia was subsequently attributed to Hodgkin lymphoma, and chemotherapy resolved her heart failure symptoms. (Level of Difficulty: Intermediate.).