Jean-Phillippe, The test TubeSpatialObjectTest has many memory leaks. The summary is at: http://public.kitware.com/Insight/Testing/HTML/TestingResults/Sites/moxel2.crd/WinNT-VC++60/20020417- 0500-Nightly/Purify/__Testing_Code_SpatialObject_itkTubeSpatialObjectTest.html Bill