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An artificial neural network approach to classification of possible tumors into benign and malignant ones in mammograms was developed earlier by the authors (1993), and an average of 75% recognition rate was shown. In this paper the authors propose a different method for improving the recognition rate. After removing the nonuniform background trend superimposed on mammographic images, the authors calculate two selected features, the standard deviation and entropy of an image, representing the texture of the image. The two texture features are then used as input to the neural network. A set of 30 breast images consisting of 20 benign and 20 malignant tumor patterns are used for investigation. The result is achieved with 100% accuracy, an improvement of 25% over the authors' previous result. The performance of the proposed method is considered to be comparable to several-year experienced radiologists. This encouraging result indicates that this method may be useful for classification of benign and malignant tumors in mammograms.