PMC6114066_01
Abdominal CT showed well-defined isodensity oval mass at the tip of appendix (a). In contrast-enhanced CT, the lesion was gradually enhanced homogeneously from arterial phase (b) to equilibrium phase (c).
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fig1
Contrast-enhanced CT revealed a lesion with gradual homogeneous contrast enhancement from the arterial phase to the equilibrium phase (Figure 1).
Abdominal ultrasonography showed that a well-demarcated hypoechoic mass of 22 mm x 18 mm x 18 mm. There were cystic area and blood flow sign.
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fig2
The tumor size was 22 mm x 18 mm x 18 mm, with some cystic area and blood flow (Figure 2).
Pathological finding in HE staining showed spindle-shaped heterotypic cells proliferating in a bundle (a). In immunohistochemical studies, the nucleus stained by S-100 protein (b).
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fig3
Immunohistochemical studies revealed negative values for KIT and CD34 and positive values for S-100 protein (Figure 3), which confirmed the schwannoma of the appendix.