Fig. 28 Leukemia. The appearance of a patient with acute lymphoblastic leukemia involving orbits bilaterally with proptosis, extraocular motility disturbance, ptosis of the left upper eyelid, and engorgement and tortuosity of the subconjunctival vessels with multiple hemorrhages (arrows) (A). Coronal T1-weighted MRI (B) and axial CT scan (C) show bilateral proptosis secondary to involvement of all extraocular muscles with infiltration of leukemic cells.