Fig. 13
From: Orbital tumours and tumour-like lesions: exploring the armamentarium of multiparametric imaging
80-year-old male patient with lymphoma of the right orbit. a. Axial T1W image of the orbits shows a hypointense, well-demarcated anterior conal-extraconal lesion (arrow). Axial T2W (b) and coronal STIR (c) images demonstrate intermediate signal intensity of the bulky mass (arrows). Note homogenous aspect. ADC map (d) reveals restricted diffusion (arrow) with very low ADC values (ADC = 0.6 × 10 −3 mm2/s) characteristic of lymphoma. Axial contrast enhanced T1W image (e) shows homogenous enhancement of the mass (arrow). There is enhancement of the superior rectus muscle (thin arrow) suggesting possible involvement. However, the ADC map clearly shows that the superior rectus muscle has no restricted diffusion (thin arrows in d and e). f. Coronal fused PET and STIR image from FDG PET/MRI reveals high tracer uptake within the mass (SUVmean = 4.8, SUVmax = 6.7). No other lymphoma manifestations were detected in the body