Add to ORKGSummary: • Key/Distinctive Features o Progressive, painless enophthalmos o Pseudoptosis o Deep superior sulcus o Measurable hypoglobus • Other Features o Typically, an older patient o Possible diplopia, typically binocular and vertical • Work-Up o Coronal MRI/CT: Ipsilateral sinus is smaller compared to contralateral sinus, leading to a vertical drop in the ipsilateral inferior rectus and/or orbit • Pathophysiology o Sinuses are constantly remolding, and remodeling based on pressure gradient o A blocked maxillary sinus ostium, e.g. an asymptomatic sinusitis, will cause negative pressure, decreasing the sinus size o A smaller sinus provides empty space for the ipsilateral inferior rectus and/or orbit to drop down, leading to the key and dist...
