Pheochromocytoma in a Twelve-Year-Old Girl with SDHB-Related Hereditary Paraganglioma-Pheochromocytoma Syndrome
Pathologic images of resected tumor. (a, b) H & E-stained sections of the tumor showing tumor cells with abundant eosinophilic cytoplasm arranged in a nested and trabecular pattern and surrounded by fibrovascular stroma. (c) Chromogranin A staining demonstrating strong positivity of tumor cells. (d) Ki67 (MIB-1) immunostaining confirmed a high proliferation index (>10%) of the tumor cell population.