Table 2.

Intraoperative and pathological findings of 13 patients with contralateral but not ipsilateral N1b.

Case number	Lymph node dissection	Extrathyroid extension	Extranodal extension	Pathological central metastasis	Pathological ipsilateral metastasis	Presence of carcino a in the contralateral lobe	Follow-up period (mos)
1	Bilateral	No	No	Yes	Yes	Yes	154
2	Unilateral	No	No	Yes	?	No	142
3	Bilateral	Yes	No	Yes	Yes	No	130
4	Bilateral	No	No	Yes	Yes	Yes	116
5	Unilateral	No	No	Yes	?	Yes	89
6	Unilateral	No	Yes	No	?	No	56
7	Bilateral	No	No	Yes	Yes	Yes	47
8	Bilateral	No	No	Yes	no	no	44
9	Bilateral	No	No	Yes	Yes	No	42
10	Bilateral	No	No	Yes	Yes	Yes	37
11	Unilateral	No	No	No	?	No	26
12	Bilateral	Yes	No	Yes	Yes	No	17
13	Unilateral	No	No	No	?	No	1