Introduction: Silent sinus syndrome is an unusual cause of progressive enophthalmos and hypoglobus due to atelectasia of the maxillary sinus associated with osteolysis of the orbital floor. This syndrome is classically idiopathic, but the term is also used to describe traumatic or iatrogenic (surgical orbital decompression) cases.
Case Report: We report the case of a 33-year-old man who presented with a left orbital trauma without functional disorder. Computed tomography (CT) scan revealed a nondisplaced fracture of the left orbital floor. No surgical indication was made. Three months later, the patient presented with progressive enophthalmos. CT revealed a complete lysis of the left orbital floor and a left maxillary sinus atelectasia.
Discussion: The original nondisplaced fracture of the orbital floor was not responsible for enophthalmos but the associated fracture of the left uncinate process that induced the closure of the left maxillary sinus infundibulum. This induced in turn hypoventilation of the sinus and a left orbital floor lysis. Treatment consisted in surgical opening of the maxillary sinus ostium and reconstruction of the orbital floor.
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