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Editor,—Spontaneous displacement of the eyeball caused by maxillary sinusitis is rare but is well documented. Different treatments have been suggested but all are surgical. Spontaneous enophthalmos due to maxillary sinusitis was first described by Montgomery; there have since been a series of reports describing this condition. The mechanism appears to arise from obstruction of the osteomeatal complex which impairs sinus ventilation. The resorption of retained secretions within the sinus produces a negative pressure which results in erosion of the thin orbital floor. In the absence of trauma the triad of obstructive sinus disease, diminished antral volume, and enophthalmos has been thought to be caused by inflammatory resorption and inferior displacement of the orbital floor. The globe …