Marker-Negative Pheochromocytoma Associated with Inferior Vena Cava Thrombosis

Figure 3

Biopsy showing oval to polygonal tumor cells with abundant granular eosinophilic to clear cytoplasm and oval nucleus. The nests of tumor cells (zellballen pattern) are separated by sustentacular cells ((a) ×200; (b) ×400).

(a)

(b)