The facial x-ray shows ‘black eyebrow sign’ in the left orbit. There is a lucent area at the superior aspect of the orbit simulating black eyebrow. It suggests the presence of an orbital blowout fracture.
Air enters the orbit secondary to breach in the wall of maxillary sinus (as in this case) but it could also be due to involvement of the ethmoid sinus.
In the above x-ray, there is also fluid in the left maxillary sinus which, in the context of the trauma, indicates blood.
Black eyebrow sign may be the only plain x-ray finding in patients with orbital blowout fracture.
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Imaging Case of the Week 47, 5.0 out of 5 based on 3 ratings