Table 4.

Local tumor progression morphology and hypothesized cause

	Focal (<90°)	Crescentic (90°–270°)	Circumferential (>270°)	Total
Patients with LTP (total no. of patients=71)	11 (46)	5 (21)	8 (33)	24 (34)
Lesions with LTP, n (%) (total no. of lesions=127)	15 (47)	7 (22)	10 (31)	32 (25)
Hypothesized cause of LTP
Aggressive disease (drug resistance and metastatic relapse)	0 (0)	3 (43)	0 (0)	3 (9)
<5 mm ablation margin	5 (33)	2 (29)	4 (40)	11 (34)
Probe malposition resulting in <5 mm ablation margin	0 (0)	0 (0)	1 (10)	1 (3)
>5 mm ablation margin, but next to a heat sink	3 (20)	0 (0)	1 (10)	4 (13)
>5 mm ablation margin, no heat sink, but >3 cm in size	5 (33)	0 (0)	2 (20)	7 (22)
No identifiable procedure-related or lesion-related cause	2 (13)	2 (29)	2 (20)	6 (19)

Data are presented as n (%).

LTP, local tumor progression.