PMC2905915_01
Axial CT scan of the pelvis after IV contrast: oval shape well-defined homogenous small mass at the bladder neck which shows intense enhancement after contrast.
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fig1
There was no associated lymphadenopathy or invasion to the surrounding pelvic structures (Figure 1). 
The tumor cells show the characteristic zellballen cells, with abundant eosinophilic cytoplasm and an ill-defined wall separated by fibrovascular stroma. Mitotic figures are not observed. Hematoxylin-Eosin Stain (X400).
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fig2
The cytoplasm was eosinophilic with indistinct borders (Figure 2).
Immunostaining for chromogranin A showed strong and diffuse positivity in the tumor cell cytoplasm (X400).
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fig3
Immunostains were positive for chromogranin A, neurone-specific enolase, S-100 protein and sinaptophysin, while immunostains for epithelial differentiation (using antikeratin monoclonal antibody) were negative (Figure 3).