Radiography remains an essential diagnostic study for both cardiac and pulmonary diseases. This online non interactive program offers an overview of the radiographic diagnosis of heart disease, heart failure, and important pulmonary differential diagnoses. Radiography remains an essential diagnostic study for both cardiac and pulmonary diseases. This online non interactive program offers an overview of the radiographic diagnosis of heart disease, heart failure, and important pulmonary differential diagnoses. The location and enlargement patterns of important cardiac structures are demonstrated using clinical cases and by angiography and high resolution CT imaging to improve the practitioner's ability to view and interpret a radiograph of the thorax in small animals.