Giant Cystic Pheochromocytoma with Low Risk of Malignancy: A Case Report and Literature Review

Figure 4

Microscopic images of pheochromocytoma. (a) Routine hematoxylin and eosin (H&E) staining at low magnification (20x) highlights the typical “Zellballen” growth pattern characterized by nests of tumor cells surrounded by delicate fibrovascular stroma. (b) Immunohistochemistry for the neuroendocrine marker chromogranin A shows strong, diffuse staining in the tumor cells.

(a)

(b)