PMC5697096_01
Macroscopic appearance of the tumor
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Fig1
Macroscopically, the mass was well-defined and unencapsulated, it had a yellowish-tan color and a firm consistency (Fig. 1).
Hematoxilin & eosin (H&E) stain showing a spindle cell proliferation with "hemangiopericytoma like" vascularization and admixed ropy collagen (x100 magnification)
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Fig2
Microscopic examination showed a well circumscribed proliferation of spindle cells arranged in a "paternless" pattern, with alternating hypo- and hypercellular areas separated by thick, hyalinized collagen with staghorn type vessels (Fig. 2).
H&E stain showing an area of cellular spindle cell proliferation with mild atypia. Some lymphocytes are observed in the background, mitoses are not apparent (x200 magnification)
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Fig3
The nuclei showed mild to moderate atypia. (Figure 3).
CD34 immunostain showing diffuse staining of the tumor cells
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Fig4
On immunohistochemical studies, tumor cells were positive for CD 34 (Fig. 4) and STAT 6 (Fig. 5).