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Aiming at the automatic diagnosis of tumors using narrow band imaging (NBI) magnifying endoscopy (ME) images of the stomach, we combine methods from image processing, topology, geometry, and machine learning to classify patterns into three classes: oval, tubular and irregular. Training the algorithm on a small number of images of each type, we achieve a high rate of correct classifications. The analysis of the learning algorithm reveals that a handful of geometric and topological features are responsible for the overwhelming majority of decisions.

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The Ross procedure (RP) is considered by many authors as the best option for aortic valve replacement in young children and adolescents. This paper presents the results of the immediate and late postoperative period (more than 5 years) after the RP among pediatric patients.