Fig. 4
From: Paravertebral paraganglioma with spinal extension: a case report
A Hematoxylin and eosin (H&E) stained section of the mass showing a characteristic nesting pattern (zellballen pattern) of cells (×200 magnification). B Hematoxylin and eosin (H&E) stained section of the mass showing a characteristic nesting pattern (zellballen pattern) of cells (×400 magnification). C Immunohistochemistry staining with chromogranin showing positive cytoplasmic staining (×400 magnification)