in high risk groups ( heavy smoking and alcohol consumption , ent-cancer ) the multicentricity of intraepithelial carcinomas ( 80 % ) entails a thorough endoscopic screening of the upper digestive tract ( mouth , pharynx , oesophagus ) and of the lower respiratory tract ( larynx , trachea and bronchi ) .
C0079304
endoscopic
C0014876
oesophagus