# BoneReconstructionPlanner: not able to make hemimandibulectomy

**URL:** <https://discourse.slicer.org/t/bonereconstructionplanner-not-able-to-make-hemimandibulectomy/44838>\
**Category:** Support\
**Tags:** surgical-planning\
**Created:** [October 21, 2025, 8:04pm UTC](https://discourse.slicer.org/t/bonereconstructionplanner-not-able-to-make-hemimandibulectomy/44838 "2025-10-21T20:04:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Davi\_Matos](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/davi_matos/32/81222_2.png) [@Davi\_Matos](https://discourse.slicer.org/u/Davi_Matos)\
**Post date:** [October 21, 2025, 8:04pm UTC](https://discourse.slicer.org/t/bonereconstructionplanner-not-able-to-make-hemimandibulectomy/44838/1 "2025-10-21T20:04:54Z")

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Hello! I am getting used to use the extension to plan for ressections, but I’m finding some problems that I’m not being able to solve on my own. I’m trying to plan the ressection from the left side of a mandible, but the fibula segmentations is not cutting on the right way. Also, the cuts were cutting through the other side of the mandible. Clicking “fix cut goes through the mandible twice” solves it to an extension, but the condile is still getting cut. I’ll send the images so you guys can see whats happening.

I appreciate the help. Don’t know what am I doing wrong. @mau_igna_06

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/a/aa951ebb2864531a3134e84772ee3c07baec8108.png)

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/3/0312cc93862ffd7d63eb0126609aee834f6199a5.jpeg)

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/0/d00e9369a62761c1f2dce8a8e80d9c6f9653544d.jpeg)

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**Author:** ![mau\_igna\_06](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mau_igna_06/32/9056_2.png) [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)\
**Post date:** [October 21, 2025, 8:09pm UTC](https://discourse.slicer.org/t/bonereconstructionplanner-not-able-to-make-hemimandibulectomy/44838/2 "2025-10-21T20:09:15Z")

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Hi Davi,

I’m glad to help you. Could you provide a Slicer scene where the problem appears?

Thank you,  
Mauro

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**Author:** ![Davi\_Matos](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/davi_matos/32/81222_2.png) [@Davi\_Matos](https://discourse.slicer.org/u/Davi_Matos)\
**Post date:** [October 21, 2025, 8:12pm UTC](https://discourse.slicer.org/t/bonereconstructionplanner-not-able-to-make-hemimandibulectomy/44838/3 "2025-10-21T20:12:46Z")

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Sure! Here’s the link: [forum - Google Drive](https://drive.google.com/drive/folders/1vJh20Rj6Esaje9gRnVp3M8sr7brws9RD?usp=sharing)

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**Author:** ![mau\_igna\_06](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mau_igna_06/32/9056_2.png) [@mau\_igna\_06](https://discourse.slicer.org/u/mau_igna_06)\
**Post date:** [October 21, 2025, 10:40pm UTC](https://discourse.slicer.org/t/bonereconstructionplanner-not-able-to-make-hemimandibulectomy/44838/4 "2025-10-21T22:40:51Z")

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You can delete the folder.

The problem is that the plane near the condyle was pointing in the wrong direction. I just turned it 180° and it worked as expected (see picture below)

 ![Screenshot from 2025-10-21 19-37-35_2](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/6/f65c53944c646f0f79615b6b2308b32cae9630bc.png)

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**Author:** ![Davi\_Matos](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/davi_matos/32/81222_2.png) [@Davi\_Matos](https://discourse.slicer.org/u/Davi_Matos)\
**Post date:** [October 24, 2025, 1:13am UTC](https://discourse.slicer.org/t/bonereconstructionplanner-not-able-to-make-hemimandibulectomy/44838/5 "2025-10-24T01:13:14Z")

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I see that now… The rotation on the plane cut influences a lot, I don’t quite get why, but it does. Thanks a lot, my friend!