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Click 13-year-old male with comminuted right orbital roof ``blow-in`` fracture (best seen at image position 11). Unenhanced CT head obtained with 5 mm contiguous axial scans of 5 mm thickness demonstrates right periorbital, preseptal, frontal, infraorbital, and zygomatic soft tissue swelling; abnormal bone density in the superior, posterior right orbital region; and an abnormal focus of intracranial air in the anterior cranial fossa (best seen at image position 12).

Click 13-year-old male with comminuted right orbital roof ``blow-in`` fracture. Unenhanced CT orbits obtained with 2 mm contiguous axial scans of 2 mm thickness. Axial images demonstrate a comminuted right orbital roof ``blow-in`` fracture (best seen at image position 10-13 ). The fracture fragment demonstrates direct contact with the superior rectus muscle. There is associated non-displaced linear fracture extension towards the supraorbital rim without supraorbital rim involvement and medial extension with involvement of the ethmoid air cells. There are two tiny foci of intracranial air in the right anterior cranial fossa.

Click 13-year-old male with comminuted right orbital roof ``blow-in`` fracture. Unenhanced CT orbits obtained with 2 mm contiguous axial scans of 2 mm thickness and reformatted in the coronal plane. Coronal images demonstrate a comminuted right orbital roof ``blow-in`` fracture (best seen at image position 17-19 ). The fracture fragment demonstrates direct contact with the superior rectus muscle. There is associated non-displaced linear fracture extension towards the supraorbital rim without supraorbital rim involvement and medial extension with involvement of the ethmoid air cells. There are two tiny foci of intracranial air in the right anterior cranial fossa.

Click 13-year-old male with comminuted right orbital roof ``blow-in`` fracture. Unenhanced CT orbits obtained with 2 mm contiguous axial scans of 2 mm thickness and reformatted in the sagittal plane. Sagittal images demonstrate a comminuted right orbital roof ``blow-in`` fracture. The fracture fragment demonstrates direct contact with the superior rectus muscle (best seen at image position 42-45 ). There is associated non-displaced linear fracture extension towards the supraorbital rim without supraorbital rim involvement and medial extension with involvement of the ethmoid air cells. There are two tiny foci of intracranial air in the right anterior cranial fossa.

Click 13-year-old male with comminuted right orbital roof ``blow-in`` fracture. Four day follow-up unenhanced CT orbits obtained with 2 mm contiguous axial scans of 2 mm thickness. Axial images demonstrate a stable comminuted right orbital roof ``blow-in`` fracture. The fracture fragment continues to demonstrate direct contact with the superior rectus muscle (best seen at image position 12-15 ). There is associated non-displaced linear fracture extension towards the supraorbital rim without supraorbital rim involvement. Ethmoid sinus involvement is not appreciated. There has been interval resolution of intracranial air.

Click 13-year-old male with comminuted right orbital roof ``blow-in`` fracture. Four day follow-up unenhanced CT orbits obtained with 2 mm contiguous axial scans of 2 mm thickness and reformatted in the coronal plane. Coronal images demonstrate a stable comminuted right orbital roof ``blow-in`` fracture. The fracture fragment continues to demonstrate direct contact with the superior rectus muscle (best seen at image position 20). There is associated non-displaced linear fracture extension towards the supraorbital rim without supraorbital rim involvement. Ethmoid sinus involvement is not appreciated. There has been interval resolution of intracranial air.