From an isolated right ventricular thrombus to the diagnosis of the hypereosinophilic syndrome.

This case concerns a 58-year-old male who presented with abdominal pain, anorexia, nausea, and exertional dyspnea of one month's duration. On further evaluation peripheral eosinophilia was conspicuous and eosinophilic infiltration was found in the gastrointestinal system and bone marrow. Echocardiography showed an isolated right ventricular thrombus with tricuspid valve involvement. Cardiac magnetic resonance imaging helped to confirm the diagnosis of cardiac involvement in hypereosinophilic syndrome without requiring a cardiac biopsy.