Fig. 4
From: Anesthetic management of a giant paraganglioma resection: a case report
Pathological diagnosis of retroperitoneal paraganglioma. Under an optical microscope, the tumor cells showed obvious nests and organoid structures (Zellballen). The tumor cells are polygonal, granular and dichroic. Flattened S-100 positive sertoli cells are seen around nests of tumor cells. Immunohistochemistry shows CgA ( +), S-100 ( +), and Syn ( +)