1. A method for automatic bone lesion detection in a 3D medical image, comprising: detecting one or more regions of interest corresponding to one or more bone regions in a 3D medical image; and detecting bone lesions in the one or more regions of interest using a cascade of trained detectors, wherein the step of detecting bone lesions in the one or more regions of interest using a cascade of trained detectors comprises: detecting bone lesions in the one or more regions of interest in each of a plurality of levels of a resolution pyramid of the 3D medical image using a respective cascade of trained detectors trained for each resolution pyramid level.