MS-3326

A 50-year-old man arrives at the emergency department after colliding with a lamppost while riding his bicycle. He reports experiencing left arm pain and limited mobility.

Upon examination, there is noticeable swelling and bruising in the left upper arm, along with a visible deformity. The left shoulder has reduced abduction.

After an X-ray, it is confirmed that the patient has a fractured neck of the left humerus.

What is the most probable additional sign that will be present?