# Observe modified segment

**URL:** <https://discourse.slicer.org/t/observe-modified-segment/7528>\
**Category:** Development\
**Tags:** segmentation\
**Created:** [July 11, 2019, 12:15pm UTC](https://discourse.slicer.org/t/observe-modified-segment/7528 "2019-07-11T12:15:35Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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:** [July 26, 2019, 3:16am UTC](https://discourse.slicer.org/t/observe-modified-segment/7528/2 "2019-07-26T03:16:37Z")

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`SegmentModified` event is invoked if segment metadata is modified. You need to observe `MasterRepresentationModified` or `RepresentationModified` to get notified about segmentation content changes. See list of events [here](https://apidocs.slicer.org/master/classvtkSegmentation.html#a1a387d4572ce52ab0c0babbecbd5a4daa82679724b676d81cd4393b6a4a388db9).

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