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Structural characteristics of lateral ventricle in brain medical images from CT scan can be helpful for distinguishing between normal brain structure and abnormal brain structure. This paper presents image processing algorithms for automatic segmentation and measurement of structural features of lateral ventricle in brain medical images. the effectiveness of such features on brain structure discrimination is also examined. Experimental results show that structural features of lateral ventricle in brain medical images, including Frontal Horn Radius and Ventricular Index, are useful for discriminating between normal and abnormal brain structure.