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An AP Shoulder image shows the superior angle of the scapula ABOVE (superior to) the mid clavicle? What is the positioning error?

All of the following should be demonstrated on a properly performed AP Elbow, except:

What is located at A? 23.png  

What should be demonstrated at the proximal end of a properly positioned AP humerus?

What is the repeatable error in this AP supine KUB, if any? 26.jpg  

An AP shoulder projection obtained with the humeral epicondyles positioned parallel with the IR demonstrates the: 1. greater tubercle in profile laterally 2. lesser tubercle in profile medially 3. humeral head in profile medially 4. greater tubercle superimposed over the humeral head

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?