Fig. 20
From: Orbital tumours and tumour-like lesions: exploring the armamentarium of multiparametric imaging
50-year-old male patient with biopsy-proven IgG4-RD of the right orbit. Coronal bone-window CT image of the orbits (a) shows a well-circumscribed, extraconal, soft tissue-density mass located inferomedially in the right orbit. It is associated with bony erosion of the lamina papyracea (arrow). b. Axial T2W image of the same patient shows very low signal within the well-circumscribed lesion (arrow). Note that it is lower than usually seen in lymphoma. c. Axial contrast-enhanced FS TIW image shows homogeneous non-specific enhancement within the lesion (arrow). d. ADC map shows restricted diffusion (ADC = 0.9 × 10 −3 mm2/s)