1. A computerized method of classifying at least one suspicious region of interest (ROI) in an ultrasonic attenuation image mapping a tissue of a patient, comprising: receiving an US image of a tissue; identifying a suspicious region of interest (ROI) in said US image; generating an attenuation map of said suspicious ROI; measuring, according to an analysis of said attenuation map, at least one attenuation feature of at least one of said suspicious ROI and at least one sub region in said suspicious ROI; and classifying said suspicious ROI according to said at least one attenuation feature.