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Diagnosis: Pneumosinus dilatans (PSD) of the sphenoid sinus
Although its precise definition has been disputed,1PSD is characterized by an abnormal dilation of an air-filled paranasal sinus2that expands beyond its normal anatomical boundaries without thinning of its bony walls.3The first reported case was described in 1918.2The frontal and sphenoid sinuses are most commonly involved,3but the maxillary sinuses, ethmoid air cells, and even a concha bullosa may be affected. The entire sinus or only a part of it may be involved.4The age at presentation varies, but PSD frequently occurs between the ages of 20 and 40 years, with a male predominance.5
Radiology Quiz Case 1: Diagnosis. Arch Otolaryngol Head Neck Surg. 2010;136(11):1142. doi:10.1001/archoto.2010.189-b
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