# Editing Segmentation contained to one small region

**URL:** <https://discourse.slicer.org/t/editing-segmentation-contained-to-one-small-region/25765>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [October 19, 2022, 1:40am UTC](https://discourse.slicer.org/t/editing-segmentation-contained-to-one-small-region/25765 "2022-10-19T01:40:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dbalentine](https://avatars.discourse-cdn.com/v4/letter/d/ba8739/32.png) [@dbalentine](https://discourse.slicer.org/u/dbalentine)\
**Post date:** [October 19, 2022, 1:40am UTC](https://discourse.slicer.org/t/editing-segmentation-contained-to-one-small-region/25765/1 "2022-10-19T01:40:31Z")

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Hello,

I am trying to edit a segmentation in the segmentation editor. I am able to edit the segmentation to some extent, but any painting or drawing is only allowed in a small rectangle around the original segmentations. Any addition (say I wanted to draw something on the far left side of the image) does not work, has anyone encountered this before?

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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:** [October 19, 2022, 5:11am UTC](https://discourse.slicer.org/t/editing-segmentation-contained-to-one-small-region/25765/2 "2022-10-19T05:11:14Z")

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This section in the documentation should help: [Segment editor — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmenteditor.html#cannot-paint-outside-some-boundaries)