TABLE 1:

Peripheral Versus Central Tumors

Characteristic	Peripheral (n = 55)	Central (n = 15)	p
Tumor size (cm)	2.5 ± 1.4	2.5 ± 1.0	0.7
Distance from tumor to diaphragm (mm)	4.6 ± 6.2	41.5 ± 20.4	< 0.001
Displacement distance (mm)	2.5 ± 4.3	0	0.002
Ablation zone size (cm)	4.3 ± 1.2	3.6 ± 0.8	0.05
Length of ablation zone butting capsule (cm)	3.6 ± 1.4	0	< 0.001
Ablation time (min)	6.5 ± 3	5.5 ± 2.5	0.2
Ablation power (W)	75.4 ± 21.7	79.3 ± 19.6	0.1
No. of diaphragmatic hernias	0	0
Diaphragm thickness before ablation (mm)	3.1 ± 1.2	3.0 ± 0.5	0.6
Diaphragm thickness immediately after ablation (mm)	4.0 ± 1.9	3.1 ± 0.5	0.2
Patients with shoulder pain, no. (%)	10 (18)	0 (0)	0.2
Average pain score	2.8 ± 2.1	2.4 ± 1.2	0.4
Initial pain score	3.5 ± 3.0	3.1 ± 2.2	0.6
Local tumor progression, no. (%)	3 (5.5)	0 (0)	1
Imaging follow-up (mo)	11.1 ± 7.9	14.1 ± 8.5	0.1

Note—Except where noted otherwise, data are mean ± SD. Peripheral tumors are those with ablation zone < 5 mm from diaphragm. Peripheral liver tumors include all lesions ablated regardless of artificial ascites. Central tumors are those with ablation zone > 1.5 cm from diaphragm.