Abstract: This invention concerns a computer implemented method for segmenting and identifying at least one tubular structure, having a 3D tree layout and located in at least one body part of a subject, in medical images showing a volume region of interest of said subject containing said body part(s), and for providing a labelled 3D image of said structure(s), said method mainly comprising the steps of: providing a set of 2D medical images corresponding to respective mutually distinct sectional views across said region of interest containing said body part(s), the planes of said medical images being all perpendicular to a given direction or all mutually intersecting at a given straight line, segmenting the visible section(s) of the concerned body part(s) present in each one of said 2D medical images, which comprises in particular the complete linear outline or external boundary of said body part(s) visible in the considered 2D image, and creating a corresponding 2D body part masking image, pre-processing each 2D me