Abyssinian, 12 Years, Thorax Sx

The front limbs of the patients are not cranially extended, decreasing the diagnostic quality of the image. What is the negative effect on a thoracic radiograph of poor positioning?

Abyssinian, 12 Years, Thorax Dx

There is the impression of having two cranial margins of the cardiac silhouette, one less opaque and a second of soft tissue opacity. What is the cause of this effect?