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A 74-year-old man was referred because of left exophthalmos and outward displacement of the orbit (Panel A). His symptoms had progressed slowly over a 4-year period but had worsened rapidly during the preceding 2 days, causing diplopia, impaired ocular movement, orbital pain, and decreased visual acuity (0.8 in the right eye and 0.2 in the left eye, corresponding to Snellen equivalents of 20/25 and 20/100, respectively). On computed tomography, a cystic lesion was observed in the left ethmoid sinus (Panel B), where it was compressing the globe (white arrow) and eroding the lamina papyracea (black arrows) and part of the . . . [Full Text of this Article] |