N0:无淋巴结转移
N1:剖腹探查时仅有一区域淋巴结转移
N2:已侵犯两个区域淋巴结
N3:临床上可以扪得区域淋巴结转移
N4:远处区域淋巴结转移
4.钱礼胰头癌分类法(1989)
Ⅰ期:T1N0M0
T1:肿瘤在胰腺内,单发性,一般<2cm
N1:无淋巴结转移
M0:无血运转移
Ⅱ期:T2N1M0
T2:癌肿已超出胰腺包膜,一般<5cm,已侵及邻接组织、胆管或十二指肠,或胆管内有多发病灶
N1:第一站淋巴结已转移
Ⅲ期:T2-3N1-2M0
T3:胰癌已侵及胃、脾或腹膜后组织如PV或SMV,一般>5cm
N2:第二站淋巴结已转移
Ⅳ期:T2-3N1-3M1
T4:胰癌已与周围组织固结
N3:已有第三站淋巴结转移
M1:已有肝转移或其他远处转移
【临床表现】

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