Professional
Technical
IVT
Siewert classification
Pronunciation: SEE-vert
Anatomical classification system for adenocarcinomas of the gastroesophageal junction based on tumor epicenter location.
Full Definition
The Siewert classification is a widely used anatomical system that categorizes adenocarcinomas of the gastroesophageal junction into three types based on the tumor's epicenter relative to the anatomical gastroesophageal junction. Type I tumors are located 1-5 cm above the junction (distal esophageal), Type II are within 1 cm above to 2 cm below (true junctional), and Type III are 2-5 cm below (subcardial gastric). This classification influences surgical approach and treatment strategy.
Usage
Usage note: Capitalize as eponym; specify type number when applicable (Type I, II, or III).
In Context
- "The tumor was classified as Siewert Type II based on endoscopic and imaging findings." — Multidisciplinary team report
- "Surgical planning differed significantly between Siewert Type I and Type III tumors." — Treatment protocol document
Also known as
AEG classification
GEJ tumor classification
Don't confuse with
Lauren classification
Borrmann classification