Resection of a Catecholamine-Elaborating Retroperitoneal Paraganglioma Invading the Inferior Vena Cava

Figure 2

Paraganglioma demonstrated with hematoxylin and eosin staining at 2x magnification (a) and 10x magnification (b) revealing characteristic well-defined “Zellballen” nest pattern of tumor cells bound by a delicate fibrovascular stroma. At 10x magnification, immunohistochemical staining is positive for chromogranin (c) and synaptophysin (d). Images courtesy of Tulane University School of Medicine, Department of Pathology.

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