[Table/Fig-1]:
Pheochromocytoma of the adrenal gland scoring scale (PASS) [11].
| Histomorphological parameter | Score |
|---|---|
| Nuclear hyperchromasia | 1 |
| Profound nuclear pleomorphism | 1 |
| Capsular invasion | 1 |
| Vascular invasion | 1 |
| Extension into periadrenal adipose tissue | 2 |
| Atypical mitotic figures | 2 |
| Greater than 3 mitotic figures/10 high-power field | 2 |
| Tumour cell spindling | 2 |
| Cellular monotony | 2 |
| High cellularity | 2 |
| Central or confluent tumour necrosis | 2 |
| Large nests or diffuse growth (>10% of tumour volume) | 2 |
| Total | 20 |