Table 3. Frequency of skip metastases according to tumor location in cases with pleural involvement.

Location	Number	N1 mets in peripheral zone (#12/#13), n [%]	Skip N1 mets in hilar/interlobar zone (#10/#11), n [%]	Skip N2 mets, n [%]	Most frequent station of skip mets
					Station	N [%]
Rt. S1	11	6 [55]	1 [9]	4 [36]	#4R	4 [36]
Rt. S2	15	7 [47]	5 [33]	3 [20]	#4R/#10	3 [20]
Rt. S3	8	4 [50]	0 [0]	4 [50]	#4R	4 [50]
Rt. S4–5	13	10 [77]	1 [8]	2 [15]	#4R	2 [15]
Rt. S6	10	4 [40]	5 [50]	1 [10]	#11i	3 [30]
Rt. S7–8	5	2 [40]	3 [60]	0 [0]	#11s	2 [40]
Rt. S9–10	5	2 [40]	2 [40]	1 [20]	#11i	2 [40]
Lt. S1+2	11	7 [64]	1 [9]	3 [27]	#5	2 [18]
Lt. S3	9	6 [66]	0 [0]	3 [33]	#5	3 [33]
Lt. S4–5	10	6 [60]	2 [20]	2 [20]	#11	2 [20]
Lt. S6	9	5 [56]	3 [33]	1 [11]	#10	2 [22]
Lt. S8	8	3 [38]	3 [38]	2 [25]	#11	2 [25]
Lt. S9–10	9	7 [78]	1 [11]	1 [11]	#7/#10	1 [11]
RUL	34	17 [50]	6 [18]	11 [32]	#4R	11 [32]
RLL	20	8 [40]	10 [50]	2 [10]	#11i	6 [30]
LUL	30	19 [63]	3 [10]	8 [27]	#5	5 [17]
LLL	26	15 [58]	7 [27]	4 [15]	#10	4 [15]
Total	123	69 [56]	27 [22]	27 [22]	–	–

Skip metastasis was defined as nodal metastasis without metastasis to more peripheral lymph nodes. Mets, metastases; Rt, right; Lt, left; RUL, right upper lobe; RLL, right lower lobe; LUL, left upper lobe; LLL, left lower lobe.