Figure 2: Findings at the last examination (18 months after the sudden left proptosis). A. Frontal view. The proptosis shows a symmetrical appearance. The Hertel measurement is 8.5 mm OU. B. Left oblique view. C. Axial computed tomography (CT) imaging shows considerable shrinkage of the tumor. D. Coronal CT imaging. The optic nerve is situated in the center of the orbit, although it is a little obscure.