[Screening for preneoplastic lesions of the upper gastrointestinal tract].

Preneoplastic lesions of the esophagus and stomach are cellular abnormalities that have the potential to develop into cancer over time. They are detected during endoscopy and can be classified according to their specific cellular characteristics. Their treatment depends on the severity of the lesion and the individual factors of each patient. Treatment options may include regular endoscopic monitoring, treatment to reduce the risk of progression to cancer (anti-reflux therapy, antibiotics for H. pylori eradication), or endoscopic removal of the lesion. It is important to discuss any concerns about these lesions with a gastroenterologist and to follow recommendations for proper screening and treatment.