Siewert-Stein classification is anatomical classification of the location of oesophago-gastric junction (OGJ) tumours
Type I Adenocarcinoma of distal part of the oesophagus (centre located within between 1-5cm above the anatomic OGJ) Type II Adenocarcinoma of the real cardia (within 1cm above and 2cm below the OGJ) Type III Adenocarcinoma of the subcardial stomach (2-5cm below OGJ)
References
Siewert classification Wikipedia(Text) CC BY-SA