[SILENT SINUS SYNDROME].

Silent sinus syndrome (SSS) is a rare condition, usually consisting of asymptomatic spontaneous collapse of the sinus walls and orbit floor. It is often found incidentally on MRI or CT imaging for other pathology work-up. The etiology of SSS remains controversial. Patients typically deny preexisting sinus disease or orbitofacial trauma. Clinical appearance usually consists of asymptomatic enophthalmos and altered facial appearance. Nevertheless, diplopia, nasal discharge, post-nasal drip, facial pressure, or pain may also be present. Most authors postulate that the collapse of the inferior orbital wall is induced by negative pressure generated by the resorption of gas after a natural ostium occlusion.