Which structures are visible on a correctly positioned lateral forearm image?

On a correctly positioned lateral forearm image, it is essential to visualize specific anatomical structures in their most informative orientation.

The olecranon process, which is the prominent part of the ulna at the elbow joint, is typically shown in profile in a lateral view. This clear profile presentation allows for the assessment of the joint's integrity and alignment, making it a key structure to be visualized in this imaging position.

Additionally, the epicondyles of the humerus, which sit at the lower part of the humerus and serve as important landmarks for muscle attachment, should be superimposed when the forearm is correctly positioned. This superimposition indicates that the forearm is aligned properly in the lateral position, allowing for an accurate assessment of the elbow and forearm's structural relationships.

Thus, both the olecranon process in profile and the superimposed epicondyles are critical features visible in a correctly positioned lateral forearm image, supporting the selection of the option indicating both B and C as the correct answer.