Intraconal tumor-like mass as first manifestation of IgG4-related disease

A great variety of tumors and tumor-like lesions can involve the orbit. Benign and malignant neoplasms, inflammatory diseases, vascular and congenital lesions take part of this heterogeneous group that creates many challenges for diagnosis, management, and treatment. Obviously, symptoms and clinical history are fundamental to establish a differential diagnosis, and imaging is mandatory to distinguish between lesions that have similar clinical presentations in most cases. With this report, the authors highlight the diagnostic difficulties and the importance to include not only tumors but also vascular inflammatory process into the differential diagnosis of this unilateral orbital lesion type.