Siewert classification

AC = anatomical cardia

Source: Ulla M, et al. Esophageal cancer characterization with pneumo-64-MDCT. Abdom Imaging. 2012 Aug;37(4):501-11. Available at: https://doi.org/10.1007/s00261-011-9784-z.

«The Siewert-Stein classification is a system of anatomical classification used for adenocarcinomas of the esophagogastric junction.»

Bibliographic reference: En.wikipedia.org. (2019). Siewert classification. [online] Available at: https://en.wikipedia.org/wiki/Siewert_classification [Accessed 28 Mar. 2019].

Esophageal regions

«Anatomy of esophageal cancer primary site, including typical endoscopic measurements of each region measured from the incisors. Exact measurements depend on body size and height. For tumors of the EGJ and cardia, location of cancer primary site (ie, esophagus, stomach) is defined by cancer epicenter.»

v: vein

Source: Uptodate.com. (2019). UpToDate. [online] Available at: https://www.uptodate.com [Accessed 28 Mar. 2019].

Esophagus lesion	Anatomic boundaries	Distance from the incisors (cm)
Cervical	Hypopharynx to sternal notch	15 to < 20
Upper thoracic	Sternal notch to azygos vein	20 to < 25
Middle thoracic	Lower border of azygos vein to inferior pulmonary vein	25 to < 30
Distal/lower thoracic	Lower border of inferior pulmonary vein to EGJ	30 to < 40
Abdominal/EGJ	EGJ to 2 cm below EGJ	40 to 45

EGJ = esophagogastric junction

Source: Rice TW, Kelsen D, Blackstone EH, Ishwaran H, Patil DT, Bass AJ et al. 16 - Esophagus and Esophagogastric Junction. In: Amin MB, Edge SB, Greene FL, Byrd DR, Brookland RK, Washington MK, et al., ed. By: AJCC Cancer Staging Manual. 8th ed. Springer International Publishing; 2017. p. 187.