“…Other findings are enlargement of extra ocular muscles, especially lateral rectus, 41 infiltration of orbital fat, enlargement of infraorbital nerve, 41 and less commonly, involvement of cavernous sinus and Meckel cave. 35,42 The main differential diagnoses are Sjögren syndrome, sarcoidosis, lymphoma, orbital inflammatory pseudotumor, and thyroid-related orbitopathy. 35 Granulomatosis with polyangiitis is an autoimmune small vessel vasculitis.…”