In classic Barret's, the length of columnar epithelium in distal oesophagus is: (A) >1cm, (B) >2cm, (C) >3cm, (D) >4cm
Answer is C. 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.