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Background: Juvenile polyposis (JP) is a frequent cause of lower gastrointestinal bleeding. It is present in 3-4% of the population < 21 years of age and represents 90% of all polyps in childhood. The most common complaints are hematoquezia, abdominal pain, and polyp prolapse., Methods: A descriptive, observational, transversal study of 225 children with histopatologic diagnosis of JP seen at the Department of Gastroenterology and Nutrition of the Instituto Nacional de Pediatría, between January 1985 and December 2000. Variables studied included age of presentation, gender, frequency, clinical manifestations, type, location, and diagnostic and therapeutic methods., Results: Frequency was one polyp per 162 patient seen during the same period (0.61%) and age 2 to 8 years (82%), a total of 235 patients, 120 females and 273 total polyps were found rectum the most common site 82% (224 polyps) followed by sigmoid. Mean distance from anal margin was 6.5 cm. Of all polyps, 82.9% were in the first 10 cm of anal margin. Of all patients, 92.3% had a single polyp and 7.7% had multiple polyps. A baritated study was made in 39 patients (16.6%) with diagnostic efficacy of 74%. No additional baritated studies were needed because of high diagnostic and therapeutic efficacy of the rectosigmoidoscopy., Conclusions: Rectosigmoidoscopy and colonoscopy remain as the diagnosis and therapeutic method in children with JP.

Background: Different antibiotics, antagonist H2 and others have been used for elimination and/or eradication of Helicobacter pylori., Aims: Evaluate elimination of Helicobacter pylori with amoxicillin, bismuth subsalicylate and ranitidine; and the improvement of recurrent abdominal pain., Method: 20 children with recurrent abdominal pain associated to gastritis and histologic identification of Helicobacter pylori were studied under a period of 18 months (January 1992 to June 1993), at Instituto Nacional de Pediatría, México, D.F. All children were treated simultaneously with: Amoxicillin, 15 days, plus ranitidine and bismuth subsalicylate for one month., Results: Helicobacter pylori was eliminated in 14 of 20 children studied. All these children had an important improvement of recurrent abdominal pain., Conclusion: Elimination of Helicobacter pylori and clinical improvement was present in 14 of 20 children studied (70%).

We present our experience in the endoscopic management of 421 children with upper gastrointestinal foreign bodies. Only in the 1% of the cases (5 patients) we had complications who needs surgical intervention. We found a 1.5:1 ratio in male/female and the highest prevalence in the 2 to 5 years group. Most common foreign bodies were coins and small metallic objects (59%) followed by small plastic by objects (35%) and seeds, fish bones and meat in 6%, meat in 6%.