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Seat belt syndrome (SBS) is a new pattern of injuries in road traffic accidents (RTAs). It refers to injuries caused by the interaction of the human body and the safety belt and consists of a wide spectrum of injuries (musculoskeletal and visceral).
In this paper, we present a case of a front-seat passenger with polytrauma sustained in an RTA, who, as a literature rarity, also suffered a thyroid cartilage fracture (TCF) caused by a seat belt.
Thyroid cartilage fracture should be kept on the list of possible injuries with a high index of suspicion for this syndrome, based on the mechanism of injury and hyperflexion of the neck, even without signs of direct neck trauma.

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