Asymptomatic paraganglioma of urinary bladder

419 abundant granular cytoplasm [Figure 1c]. The pathological tumor margin was free indicating that the tumor was completely resected. Immunohistochemical stain revealed positive for cluster of differentiation 56 (CD56), chromogranin, synaptophysin, and S-100 and negative for cytokeratin 7 (CK7). Sustentacular cells were highlighted by S-100 staining [Figure 1d]. The diagnosis of paraganglioma of the urinary bladder was made.