Orbital Solitary Fibrous Tumor: Four Case Reports—Clinical and Histopathological Features

Figure 9

Case 2. (a) Microscopically, the tumor reveals fibroblastic proliferation with hypo- and hypercellular areas alternating with each other and bands of sclerotic collagen fiber networks (arrow points at the more hypocellular area) (H&E, ×40 magnification). (b) Higher magnification demonstrates the cellular phase of the tumor with tightly packed fusiform cells arranged around a ramifying vascular network (H&E, ×100 magnification). Positivity of the tumor for (c) CD34 and (d) CD99. Bar is indicated in μm, down and to the right.

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