Radiation pericarditis
Radiation pericarditis is caused by radiation damage to the heart and pericardium. It is often a complication of radiotherapy for malignant tumors in the chest and mediastinum, such as radiotherapy for breast cancer, Hodgkin's disease, and non-Hodgkin's lymphoma. A few patients present with symptoms of acute pericarditis, including fever, precordial pain, anorexia, general malaise, pericardial friction murmurs, and abnormal electrocardiograms. Delayed pericarditis often occurs 4 to 20 years after radiotherapy, most commonly within 12 months, with acute nonspecific pericarditis or asymptomatic pericardial effusion and pleural effusion, which gradually subsides over months or years.