A relationship between Horner syndrome and thoracic trauma is exceedingly rare. We present the case of a 46-year-old man who was brought to our center after an accidental fall from a height of 4 meters. He sustained multiple ribs fractures as well as scapular and clavicle fractures in the left hemithorax. During his hospital stay, he developed Horner syndrome due to a posterior fracture of the first rib.
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