What structure is demonstrated in images of the elbow in lateral position with the hand in external rotation?

• A. Scapula
• B. Radial head
• C. Acromion process
• D. Coracoid process

Answer: (B)

In imaging of the elbow positioned laterally with the hand in external rotation, the radial head is effectively demonstrated. This positioning is crucial because when the hand is externally rotated, it allows the radial head to be positioned in a way that minimizes its overlap with the ulna. This provides a clearer view of the radial head, which is essential for assessing conditions like fractures or dislocations.

The lateral view of the elbow primarily showcases the relationship between the radius and the ulna, and with the hand in this specific rotational position, it enhances the visibility of the radial head. It allows radiologists to evaluate the joint space and any potential abnormalities more accurately.

Other structures mentioned, such as the scapula, acromion process, and coracoid process, are not relevant to the lateral view of the elbow being studied; they are associated with the shoulder region and not the elbow joint itself.