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Which position would best demonstrate the radial head of the Elbow without superimposition?

PA Oblique Thumb: What positioning error occurred in this image, if any? 2. Accurately positioned thumb.png  

AP Shoulder with the epicondyles perpendicular to the IR (internal rotation) is used to demonstrate:

AP Humerus image demonstrated the epicondyles not in profile as well as extreme radial head and ulna superimposition (more than 0.25 inch). What was the ERROR here?

An AP Scapula projection shows that inferolateral border of the scapula being superimposed with the thoracic cavity and the superior angle of the scapula superimposed by the clavicle. What is the error?

A less than optimal AP elbow projection demonstrating the ulna without any radial head superimposition ___

Scapula Y View demonstrates the head of the humerus below the acromion. What is the trauma, if any?

What ERROR, if any, is present in this decubitus? 1.png  

Upright Abdomen for free air on male patient. How should this be corrected? 18.png 

What position is done here? 14.png