PRTN3 and orbital plasma cell granuloma: Lymphoma cases may show a significantly increased B-/T-cell ratio compared to orbital pseudotumor.26, 27 In addition, cANCA levels should be investigated in patients with orbital pseudotumor as a possible sign of Wegener's granulomatosis.28 Mimics of orbital pseudotumors include congenital orbital mass lesions or orbital neoplastic diseases such as lymphoma or rhabdomyosarcoma.