Question

which of the following must be clearly visible on a diagnostic posteroanterior (pa) wrist radiograph with radial deviation?
carpals on the medial side
carpals on the lateral side
pisiform in profile
scaphoid in profile

Explanation:

In a posteroanterior (PA) wrist radiograph with radial deviation, the scaphoid is best visualized in profile. This positioning helps to separate the scaphoid from overlapping structures. The carpals on the medial or lateral side are not the key - structures to be clearly visible in this specific view, and the pisiform in profile is not the main structure of interest in this radiograph.

Answer:

Scaphoid in profile