Case 2. (A and B) Choroidal vessels are filled with atypical cells (arrows), which are CD68+. (C) A subretinal infiltrate of leukemic cells (arrows), admixed with hemorrhage, is also seen. (D) The subretinal infiltrate and choroidal vessels contain a significant number of CD68+ cells (arrows). R = retina, Ch = choroid. (A and C, hematoxylin & eosin; B and D, avidin-biotin-complex immunoperoxidase; A and B, original magnification × 100; C and D, original magnification × 200).