MRI features suggestive of orbital pseudotumor. The main differential diagnosis includes:

• orbital lymphoma: usually presents as a progressive orbitopathy, more often bilateral with lower values on ADC and does not respond to corticosteroid
• orbital cellulitis: usually associated with a subperiosteal abscess from adjacent sinusitis or presents a previous history of trauma/dental procedure
• thyroid-associated orbitopathy (TAO): usually not painful, and spares the tendinous insertions
• granulomatosis with polyangiitis: bilateral involvement of the orbits, and  PNS with associated osseous destruction