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Siewert classification esophagogastric junction tumor

The Z-line is the point at which the esophageal mucosa changes from stratified squamous to columnar epithelium, and it is designated as 0 cm.

Modified from: Siewert JR, Hölscher AH, Becker K, Gössner W. [Cardia cancer: attempt at a therapeutically relevant classification]. [Article in German] Chirurg 1987; 58:25.

Graphic 101001 Version 3.0