Table 7.

Comparison of inherent aggressiveness of different Bosniak classifications

Variables	Bosniak I, II, and IIF	Bosniak III	Bosniak IV	P
No. of patients	52	194	177
No. of histologic subtyp (%)				< 0.001
ccRCC	19 (36.5)	149 (76.8)	144 (81.4)
MCRNLMP	15 (28.8)	20 (10.3)	7 (4.0)
pRCC	11 (21.2)	12 (6.2)	8 (4.5)
cRCC	1 (1.9)	7 (3.6)	6 (3.4)
Others	6 (11.5)	6 (3.1)	12 (6.8)
No. of malignant potential (%)				< 0.001
High aggressiveness	29 (55.8)	153 (78.9)	150 (84.7)
Low aggressiveness	23 (44.2)	41 (21.1)	27 (15.3)
No. of Fuhrman grade (%)				< 0.001
I	20 (66.7)	19 (11.2)	12 (7.4)
II	10 (33.3)	142 (83.5)	139 (85.8)
III	0	9 (5.3)	11 (6.8)