Table 1: Pheochromocytoma of the adrenal gland scoring scale (PASS) [38].

Items Value Nuclear hyperchromasia 1 Profound nuclear pleomorphism 1 Capsular invasion 1 Vascular invasion 1 Extension into adipose tissue 2 Atypical mitotic figures 2 Greater than 3 of 10 mitotic figures high-power field 2 Tumor cell spindling 2 Cellular monotony 2 High cellularity 2 Central or confluent tumor necrosis 2 Large nests or diffuse growth (>10% of tumor volume) 2 Total 20