In classic Barret's, the length of columnar epithelium in distal oesophagus is
Classic Barrett's (>= 3cm columnar epithelium);Sho-segment Barrett's (<3 cm of columnar epithelium);Cardia metaplasia (intestinal metaplasia at the oesophagogastric junction without any macroscopic change at endoscopy).The relative risk of cancer rises with increasing length of abnormal mucosa.
>1cm
>2cm
>3cm
>4cm
G.I.T