CT (a) and MRI (b: T2-weighted image; (c and d): contrast-enhanced T1-weighted images) of orbital space in 44-year-old man (case 4). Soft tissue mass is detected in the right orbital space (a; arrow). This lesion extends along the right optic nerve in MRI (b–d; arrows). The right optic nerve penetrating the lesion is detectable in MRI (b and d; small arrows). Soft tissue mass along the right infraorbital nerve is also noted (a–c; arrowheads).
