Teenager who butted heads with a friend

CT of orbital blowout fracture
Coronal CT without contrast of the orbits in bone windows (above) shows a fracture line through the floor of the left orbit along with some intraorbital air medially. Coronal CT in soft tissue windows (below) shows herniation of fat through the orbital floor fracture and into the roof of the left maxillary sinus. The left inferior rectus muscle is coursing towards the fracture which suggests muscle entrapment.

The diagnosis was left orbital blowout fracture.