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Initially considered relatively resistant to radiation damage, the heart has been shown over the past 4 decades to be susceptible to radiation-induced cardiovascular toxicity and despite advances in XRT which can minimize radiation exposure to heart tissue, no cardiac radiation dose is entirely safe. The clinical spectrum of radiation-induced cardiovascular toxicity is broad, encompassing coronary artery disease, myocardial dysfunction, valvular abnormalities, and pericardial disorders. Radiation-induced cardiovascular toxicity may manifest acutely or many years after XRT, with each condition more likely to present at certain time points post-XRT. 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