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The pathology of the tumor showing anterior mediastinal paraganglioma. (A) HE staining showed that the tumor was composed of nests of cells arranged in a classic Zellballen pattern with abundant blood sinuses between cell nests (magnification ×200). (B-D) Immunohistochemical staining showed CgA, S-100, and Syn positivity (+) in tumor cells (magnification ×100). HE, hematoxylin and eosin; CgA, chromogranin A; Syn, synaptophysin.
