# How to import two stl, superimpose and get volume differences

**URL:** <https://discourse.slicer.org/t/how-to-import-two-stl-superimpose-and-get-volume-differences/14262>\
**Category:** Support\
**Created:** [October 27, 2020, 5:45am UTC](https://discourse.slicer.org/t/how-to-import-two-stl-superimpose-and-get-volume-differences/14262 "2020-10-27T05:45:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bharat](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/bharat/32/8615_2.png) [@bharat](https://discourse.slicer.org/u/bharat)\
**Post date:** [October 27, 2020, 5:45am UTC](https://discourse.slicer.org/t/how-to-import-two-stl-superimpose-and-get-volume-differences/14262/1 "2020-10-27T05:45:04Z")

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Operating system:  
Slicer version:  
Expected behavior:  
Actual behavior:

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [September 7, 2021, 10:03pm UTC](https://discourse.slicer.org/t/how-to-import-two-stl-superimpose-and-get-volume-differences/14262/2 "2021-09-07T22:03:09Z")

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You can load the STL files as segmentations and use [Segment Comparison module](https://slicer.readthedocs.io/en/latest/user_guide/image_segmentation.html#segment-comparison-module-overview) to compare them. You can also subtract the segments from each other and compute volumes using [Segment statistics module](https://slicer.readthedocs.io/en/latest/user_guide/image_segmentation.html#Segment-statistics-module-overview).