History: Shoulder pain
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Case 3 Answer
Does this image help?
Answer: Posterior shoulder dislocation
because posterior dislocations are generally straight backwards, they can be difficult to notice on the frontal exams if you aren’t looking for them. Here we see:
absent external rotation
loss of normal glenohumeral overlap
widened glenohumeral joint
light bulb sign-ish?
But always note when the frontal views show both humeral heads in either external rotation (anterior dislocation) or internal rotation (posterior dislocation).