Size -related changes of the heart and their consequences (e.g. compression of the main bronchi etc) can be detected on x-rays of different levels of the thorax. The assessment of the lungs, which is often directly involved in the clinical picture of heart diseases, and may include, for example, symptoms of congestive heart failure (pulmonary oedema), is possible almost exclusively through the radiological tests.
However, the X-ray is a static method. It does not allow assessment of cardiac action or of the internal structures of the heart. This is only possible by echocardiography.
Lateral radiograph of the chest of a 10 -year-old female Doberman with dilated
cardiomyopathy (DCM ) . A severe pulmonary oedema can be seen next to the silhouette of an enlarged heart.