1. A medical device for diagnosing malignant nodules in a bodily organ, comprising: an ultrasound elastographer configured to quantify tissue strain generated by either in vivo compression or external compression of the bodily organ to produce elastography information; a benign/malignant scorer configured to transform elastography information of each nodule into a nodule stiffness index; and a nodule screener configured to classify a nodule as Type I, which is benign for further observation, or as Type II, which is malignant for invasive procedures.