An immunosuppressed 37-year-old woman with right atrial necrotising myocarditis.

A 37-year-old immunocompromised woman was admitted with palpitations, fevers and myalgias. An echocardiogram demonstrated a mass in the right atrial walls and interatrial septum. Endovascular biopsy of the myocardium revealed neutrophilic necrotising myocarditis isolated to the right atrium.