# When loading a DICOMRT file from MIM into 3DSlicer, there is a strange slit that appears. 

**URL:** <https://discourse.slicer.org/t/when-loading-a-dicomrt-file-from-mim-into-3dslicer-there-is-a-strange-slit-that-appears/27361>\
**Category:** Support\
**Tags:** segmentation, 3d-printing\
**Created:** [January 19, 2023, 6:02pm UTC](https://discourse.slicer.org/t/when-loading-a-dicomrt-file-from-mim-into-3dslicer-there-is-a-strange-slit-that-appears/27361 "2023-01-19T18:02:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rickyman12](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rickyman12/32/18089_2.png) [@rickyman12](https://discourse.slicer.org/u/rickyman12)\
**Post date:** [January 19, 2023, 6:02pm UTC](https://discourse.slicer.org/t/when-loading-a-dicomrt-file-from-mim-into-3dslicer-there-is-a-strange-slit-that-appears/27361/1 "2023-01-19T18:02:49Z")

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We exported a DICOM-RT file from MIM into 3DSlicer. The segmentation displays well on 2D View. In 3D render it shows as having 2 slits, which do not appear on 3D surface view in MIM. Wondering why this happens and if there is an easy way to remove these slits? Thank you!

 ![MicrosoftTeams-image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/4/c4e2f8d061abdb32be3d7e3ab501d48a38021890.png)

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**Author:** ![Sunderlandkyl](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sunderlandkyl/32/79987_2.png) [@Sunderlandkyl](https://discourse.slicer.org/u/Sunderlandkyl)\
**Post date:** [January 19, 2023, 6:14pm UTC](https://discourse.slicer.org/t/when-loading-a-dicomrt-file-from-mim-into-3dslicer-there-is-a-strange-slit-that-appears/27361/2 "2023-01-19T18:14:43Z")

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Do you see the same slits if you visualize the segmentation in 3D using Ribbon model?