Late enophthalmos mimicking silent sinus syndrome secondary to orbital trauma.

The authors present a retrospective case report of a patient who experienced late enophthalmos after blunt orbital trauma. A 27-year-old man presented with subacute onset of enophthalmos, hypoglobus, superior sulcus deformity, and computed tomography evidence of a collapsed maxillary sinus 6 months after sustaining an ipsilateral moderately displaced orbital floor fracture. He was taken to surgery for left endoscopic maxillary antrostomy and implantation of an alloplastic orbital floor graft. Two months after surgery, the patient's diplopia, enophthalmos, hypoglobus, and superior sulcus deformity were markedly improved. Reestablishment of maxillary sinus aeration, the orbital floor, and the medial wall successfully relieved the symptoms and signs of maxillary wall implosion. The mechanism of this rare condition, which shares features similar to silent sinus syndrome, is presented.