[The role of alimentary oxidants and antioxidants in carcinogenesis].

Malignancies have a distinguished role among leading causes of death around the world. As a result of more effective preventive efforts of cardiovascular diseases malignancies will reach the top of death statistics in the near future. The increased incidence of malignant tumors may be attributed to smoking, in temperate alcohol abuse, as well as inappropriate nutrition.

[Multiple lymphomatous polyposis--rare case of gastrointestinal hemorrhage].

The authors report a case of a 57 years old male patient, who was admitted to gastroenterology department with upper gastrointestinal haemorrhage. The urgent upper gastrointestinal endoscopy revealed an ulcerated polypoid tumor in the region of angulus of the stomach, and multiple polypoid lesions in the bulbar part of the duodenum. Upon this endoscopic appearance colonoscopy was performed, which revealed a polyposis syndrome in the colorectum.

[Endoscopic treatment of cholestasis caused by Ascaris lumbricoides].

The most common infection of the hepatobiliary system and of the pancreas is the infestation with Ascaris lumbricoides. Pancreatobiliary ascariasis may present as recurrent biliary colic, acalculous cholecystitis, cholangitis, pancreatitis, or hepatic abscess. Although ultrasonography is a highly sensitive and specific method for the detection of the disease, endoscopy may have also therapeutical potential.