Spontaneous Retroperitoneal Bleeding as a Complication of Unusual Renal Paraganglioma

Table 1

Parameters and score in the Grading system for Adrenal Pheochromocytoma and Paraganglioma (GAPP) by Noriko Kimura et al. (https://doi.org/10.3390/jcm7090242).

Parameters	Score
Histologic pattern
Zellballen	0
Large and irregular cell nest	1
Pseudorosette (even focal)	1
Cellularity
Low (less than 150 cells/U)	0
Moderate (150–250 cells/U)	1
High (more than 250 cells/U)	2
Comedo necrosis
Absence	0
Presence	2
Vascular or capsular invasion
Absence	0
Presence	1
Ki67 labeling index
Less than 1%	0
1–3%	1
More than 3%	2
Catecholamine type
Adrenaline type (A, or a + NA)	0
Noradrenaline type (NA, or NA + DA)	1
Nonfunctioning type	0
Total maximum score	10

U: cells in the unit of 10 mm under high--power field (400); A: adrenaline; NE: noradrenaline; DA: dopamine.