# Project tumor model onto skull surface for craniotomy planning / Extension "Trackerless Craniotomy Planning based on 3D Slicer "

**URL:** <https://discourse.slicer.org/t/project-tumor-model-onto-skull-surface-for-craniotomy-planning-extension-trackerless-craniotomy-planning-based-on-3d-slicer/45950>\
**Category:** Development\
**Tags:** segmentation, extensions-manager\
**Created:** [January 27, 2026, 5:54pm UTC](https://discourse.slicer.org/t/project-tumor-model-onto-skull-surface-for-craniotomy-planning-extension-trackerless-craniotomy-planning-based-on-3d-slicer/45950 "2026-01-27T17:54:55Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![thymallus](https://avatars.discourse-cdn.com/v4/letter/t/e47c2d/32.png) [@thymallus](https://discourse.slicer.org/u/thymallus)\
**Post date:** [January 27, 2026, 5:54pm UTC](https://discourse.slicer.org/t/project-tumor-model-onto-skull-surface-for-craniotomy-planning-extension-trackerless-craniotomy-planning-based-on-3d-slicer/45950/1 "2026-01-27T17:54:55Z")

</div>

Hi,

does this extension still exist? i can’t find it … can anyone help me? 🙂

[![](https://img.youtube.com/vi/0T5x1VdyTyw/maxresdefault.jpg "Trackerless Craniotomy Planning based on 3D Slicer") ](https://www.youtube.com/watch?v=0T5x1VdyTyw)

[https://www.researchgate.net/publication/323739599\_Trackerless\_surgical\_image-guided\_system\_design\_using\_an\_interactive\_extension\_of\_3D\_Slicer](https://www.researchgate.net/publication/323739599_Trackerless_surgical_image-guided_system_design_using_an_interactive_extension_of_3D_Slicer)

Are there any other extensions that can project tumor boundaries onto the skull?

best,  
Stef