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Fig. 3A. —39-year-old man with 2-month history of diplopia. T2-weighted MR image obtained in coronal plane using fat-saturation technique shows opacified fully developed right maxillary sinus with retraction of orbital floor (arrowhead) into sinus lumen. Position of left uncinate process (U) is normal. Right uncinate process is apposed to inferomedial orbital floor, occluding maxillary sinus infundibulum (arrow). Medial sinus wall and middle turbinate are laterally retracted, causing enlargement of middle meatus (asterisk).