A 50-year-old man presents after sustaining a gunshot wound to the left arm. Upon his arrival, the patient is awake and alert, complaining of left arm pain and some mild lower extremity weakness and numbness, predominantly on his left side.

The patient’s vital signs are stable, and his medical history is unremarkable. Examination demonstrates an entrance wound on the posterior left arm just below the deltoid. No exit wound is noted. Lower extremity examination reveals diffuse weakness with almost a hyperesthetic sensation in both lower extremities. Chest radiograph is shown.