Florid Proliferation of Hyalinized Vessels in a Spermatic Cord STAT6 Positive Solitary Fibrous Tumor and Its Potential Clinical Implications

Figure 3

Microscopic features and immunohistochemical results. (a) Typical hypo- and hypercellular areas of the tumor (H&E, x40). (b) Vessels containing proliferating myocytes associated with complete mural hyalinization (arrow) (H&E, x100). (c) A vessel with mural myxoid degeneration (H&E, x100). (d) Bland looking neoplastic cells with oval to fusiform nuclei and little cytoplasm around hyalinized small vessels (arrow) (H&E, x400). (e) Numerous hemangiopericytoma-like vascular channels (CD34, x100). (f) STAT6 immunostain showing strong diffuse nuclear positivity in the neoplastic cells. The vascular myocytes are negative (STAT6, x200).

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