Gotta love this article, the husband 3D printed the MRI scans of his wife’s brain to show where cancer was and to find a simpler surgery for her. What was interesting was the software, invesalius, which is a free download, to convert the MRI to a 3D scan is free to use. Actually turns up there are a bunch of them, DeVIDE, Seg3D, ImageVis3D, and MeshLab or MeshMixer, which can all do this.
http://hackaday.com/2015/01/17/husband-uses-mri-images-to-3d-print-wifes-skull-and-tumor/