# ROI-based segmentation in MONAI Label Slicer extension does not work correctly for specific labels

**URL:** <https://discourse.slicer.org/t/roi-based-segmentation-in-monai-label-slicer-extension-does-not-work-correctly-for-specific-labels/45634>\
**Category:** Support\
**Created:** [December 30, 2025, 4:27am UTC](https://discourse.slicer.org/t/roi-based-segmentation-in-monai-label-slicer-extension-does-not-work-correctly-for-specific-labels/45634 "2025-12-30T04:27:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![anuragp2018](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/anuragp2018/32/77765_2.png) [@anuragp2018](https://discourse.slicer.org/u/anuragp2018)\
**Post date:** [December 30, 2025, 4:27am UTC](https://discourse.slicer.org/t/roi-based-segmentation-in-monai-label-slicer-extension-does-not-work-correctly-for-specific-labels/45634/1 "2025-12-30T04:27:57Z")

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### Problem Description

I am using the **MONAI Label Slicer extension** to perform **ROI-based segmentation** for a **specific label**.  
Although the ROI is drawn correctly in Slicer, the segmentation result does **not respect the selected ROI and target label**.

Observed behavior:

- The model **ignores the ROI** or partially applies it

- The output segmentation includes **regions outside the ROI**

- Sometimes a **different label** is segmented instead of the selected one

- Results are inconsistent across multiple runs on the same data

Expected behavior:

- Segmentation should be **strictly constrained to the provided ROI**

- Only the **selected label** should be segmented

- Output should be deterministic for the same ROI and input volume