Fig. 3

The cut surface of the tumour was tan and darkened, with focal haemorrhage and extended to the adrenal cortex but was well-circumscribed (a). The tumour showed characteristic “Zellballen” architecture and tumor cells were larger than normal chromaffin cells, and their cytoplasm was granular (b). Immunostaining for S-100 protein demonstrate the sustentacular framework surrounding the tumor cells (c) and positive for chromogranin (d)