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Figure 3: (a) AE1 AE3 100. (b) CD34. (c) H and E 400. (d) Vimentin 100. Immunohistochemically, these spindled cells express vimentin and CD34 but not AE1/AE3. The proliferation index determined by Ki‑67 is focally increased (up to 10%). Taken together, the tumor is most consistent with a malignant solitary fibrous tumor

Figure 3: (a) AE1 AE3 100. (b) CD34. (c) H and E 400. (d) Vimentin 100. Immunohistochemically, these spindled cells express vimentin and CD34 but not AE1/AE3. The proliferation index determined by Ki‑67 is focally increased (up to 10%). Taken together, the tumor is most consistent with a malignant solitary fibrous tumor