Table 1. Distribution of the different B-categories.

B-Classification	B2	B3	B5a	B5b	Total (n)
Age range in years	16–94	20.9–87.8	33.9–85.8	20.6–96.5
Mean Age SD	51.46 ± 14.14	56.33 ± 13.67	59.24 ± 12.69	63.29 ± 14.37
Guidance
Ultrasound	711	63	27	927	1728
Stereotactic	145	28	88	40	301
Total (n)	856	91	115	967	2029