In gdcmDampleData, I renamed the "were_in_gdcmData" (*) directory to "images_of_interest". All the images (should/will) have a .README.txt small comment, explaining the header particularity. I just added one image from NA-MIC, with a vr = "UN", that's not so common. (*) in http://www.creatis.univ-lyon1.fr/~jpr/PUBLIC/gdcm JPRx