Accuracy and Pitfalls in the Assessment of Early Gastrointestinal Lesions.

Superficial neoplastic lesions of the digestive tract are usually asymptomatic, and often represent incidental findings on endoscopy. The Paris Classification was developed for the systematic evaluation of superficial lesions of the oesophagus, stomach and colon. The significance of this classification in clinical practice is that it allows the depth of invasion to be estimated. Chromoendoscopy is used to improve the visualization of gastrointestinal lesions. There are 2 types of chromoendoscopy: dye and virtual chromoendoscopy. In addition to chromoendoscopy, advanced endoscopy techniques have great importance in the detection of early gastrointestinal lesions. Although the depth of invasion can be estimated by endoscopy, the final decision regarding therapeutic approach is made on the basis of histopathological examination, as obtained by biopsy or endoscopic resection (ER). Polypectomy, endoscopic mucosal resection, and endoscopic submucosal dissection may be considered ER. For early gastrointestinal lesions with or without limited submucosal infiltration, ER can serve as therapy. In patients with neoplastic lesions localized deeper than the submucosa, or if the location of the lesion carries a high risk of perforation, a full-thickness resection can be performed. Guidelines for assessment and therapy of early oesophageal, gastric and colorectal lesions are currently available.