diff --git a/.webpack/rules/stylusToJavaScript.js b/.webpack/rules/stylusToJavaScript.js
new file mode 100644
index 00000000000..1d83f95281e
--- /dev/null
+++ b/.webpack/rules/stylusToJavaScript.js
@@ -0,0 +1,10 @@
+const stylusToJavaScript = {
+  test: /\.styl$/,
+  use: [
+    { loader: 'style-loader' }, // 3. Style nodes from JS Strings
+    { loader: 'css-loader' }, // 2. CSS to CommonJS
+    { loader: 'stylus-loader' }, // 1. Stylus to CSS
+  ],
+};
+
+module.exports = stylusToJavaScript;
diff --git a/.webpack/webpack.base.js b/.webpack/webpack.base.js
index 004c73ece8e..6efedd0d2cd 100644
--- a/.webpack/webpack.base.js
+++ b/.webpack/webpack.base.js
@@ -18,6 +18,7 @@ const loadShadersRule = require('./rules/loadShaders.js');
 const loadWebWorkersRule = require('./rules/loadWebWorkers.js');
 const transpileJavaScriptRule = require('./rules/transpileJavaScript.js');
 const cssToJavaScript = require('./rules/cssToJavaScript.js');
+const stylusToJavaScript = require('./rules/stylusToJavaScript.js');
 
 // ~~ ENV VARS
 const NODE_ENV = process.env.NODE_ENV;
@@ -112,6 +113,9 @@ module.exports = (env, argv, { SRC_DIR, ENTRY }) => {
           },
         },
         cssToJavaScript,
+        // Note: Only uncomment the following if you are using the old style of stylus in v2
+        // Also you need to uncomment this platform/app/.webpack/rules/extractStyleChunks.js
+        // stylusToJavaScript,
         {
           test: /\.wasm/,
           type: 'asset/resource',
diff --git a/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts b/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
index 50e2d2c3c16..eda99b7b2f4 100644
--- a/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
+++ b/extensions/cornerstone/src/services/SegmentationService/SegmentationService.ts
@@ -189,7 +189,7 @@ class SegmentationService extends PubSubService {
         );
       }
 
-      if (active !== undefined) {
+      if (active === true) {
         this._setActiveSegment(segmentationId, segmentIndex, suppressEvents);
       }
 
@@ -399,6 +399,23 @@ class SegmentationService extends PubSubService {
     return segmentations && segmentations.map(m => this.segmentations[Object.keys(m)[0]]);
   }
 
+  public getActiveSegmentation(): Segmentation {
+    const segmentations = this.getSegmentations();
+
+    return segmentations.find(segmentation => segmentation.isActive);
+  }
+
+  public getActiveSegment() {
+    const activeSegmentation = this.getActiveSegmentation();
+    const { activeSegmentIndex, segments } = activeSegmentation;
+
+    if (activeSegmentIndex === null) {
+      return;
+    }
+
+    return segments[activeSegmentIndex];
+  }
+
   /**
    * Get specific segmentation by its id.
    *
diff --git a/extensions/cornerstone/src/utils/stackSync/toggleStackImageSync.ts b/extensions/cornerstone/src/utils/stackSync/toggleStackImageSync.ts
index 65ce12ea8ec..d18768f38b4 100644
--- a/extensions/cornerstone/src/utils/stackSync/toggleStackImageSync.ts
+++ b/extensions/cornerstone/src/utils/stackSync/toggleStackImageSync.ts
@@ -12,7 +12,8 @@ export default function toggleStackImageSync({
   const { syncGroupService, viewportGridService, displaySetService, cornerstoneViewportService } =
     servicesManager.services;
 
-  const viewports = providedViewports || getReconstructableStackViewports(viewportGridService, displaySetService);
+  const viewports =
+    providedViewports || getReconstructableStackViewports(viewportGridService, displaySetService);
 
   // create synchronization group and add the viewports to it.
   viewports.forEach(gridViewport => {
@@ -46,7 +47,7 @@ function disableSync(syncName, servicesManager) {
       syncName
     );
   });
-};
+}
 
 /**
  * Gets the consistent spacing stack viewport types, which are the ones which
@@ -77,4 +78,4 @@ function getReconstructableStackViewports(viewportGridService, displaySetService
     }
   });
   return viewports;
-};
+}
diff --git a/modes/longitudinal/src/index.js b/modes/longitudinal/src/index.js
index c12219c274d..25397a2cf74 100644
--- a/modes/longitudinal/src/index.js
+++ b/modes/longitudinal/src/index.js
@@ -40,7 +40,7 @@ const dicomSeg = {
   panel: '@ohif/extension-cornerstone-dicom-seg.panelModule.panelSegmentation',
 };
 
-const dicomRt = {
+const dicomRT = {
   viewport: '@ohif/extension-cornerstone-dicom-rt.viewportModule.dicom-rt',
   sopClassHandler: '@ohif/extension-cornerstone-dicom-rt.sopClassHandlerModule.dicom-rt',
 };
@@ -218,8 +218,8 @@ function modeFactory({ modeConfiguration }) {
                   displaySetsToDisplay: [dicomSeg.sopClassHandler],
                 },
                 {
-                  namespace: dicomRt.viewport,
-                  displaySetsToDisplay: [dicomRt.sopClassHandler],
+                  namespace: dicomRT.viewport,
+                  displaySetsToDisplay: [dicomRT.sopClassHandler],
                 },
               ],
             },
@@ -240,7 +240,7 @@ function modeFactory({ modeConfiguration }) {
       ohif.sopClassHandler,
       dicompdf.sopClassHandler,
       dicomsr.sopClassHandler,
-      dicomRt.sopClassHandler,
+      dicomRT.sopClassHandler,
     ],
     hotkeys: [...hotkeys.defaults.hotkeyBindings],
     ...modeConfiguration,
diff --git a/modes/segmentation/.prettierrc b/modes/segmentation/.prettierrc
new file mode 100644
index 00000000000..28448abdf42
--- /dev/null
+++ b/modes/segmentation/.prettierrc
@@ -0,0 +1,11 @@
+{
+  "trailingComma": "es5",
+  "printWidth": 100,
+  "proseWrap": "always",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": true,
+  "arrowParens": "avoid",
+  "singleAttributePerLine": true,
+  "endOfLine": "auto"
+}
diff --git a/package.json b/package.json
index dceeec8b347..cb9d4855489 100644
--- a/package.json
+++ b/package.json
@@ -130,6 +130,8 @@
     "source-map-loader": "^4.0.1",
     "start-server-and-test": "^1.10.0",
     "style-loader": "^1.0.0",
+    "stylus": "^0.59.0",
+    "stylus-loader": "^7.1.3",
     "terser-webpack-plugin": "^5.1.4",
     "typescript": "4.6.4",
     "unused-webpack-plugin": "2.4.0",
diff --git a/platform/app/.webpack/rules/extractStyleChunks.js b/platform/app/.webpack/rules/extractStyleChunks.js
index 94388a353dd..f7c467fc631 100644
--- a/platform/app/.webpack/rules/extractStyleChunks.js
+++ b/platform/app/.webpack/rules/extractStyleChunks.js
@@ -2,6 +2,20 @@ const ExtractCssChunksPlugin = require('extract-css-chunks-webpack-plugin');
 
 function extractStyleChunks(isProdBuild) {
   return [
+    // If you are using the old stylus, you should uncomment this
+    // {
+    //   test: /\.styl$/,
+    //   use: [
+    //     {
+    //       loader: ExtractCssChunksPlugin.loader,
+    //       options: {
+    //         hot: !isProdBuild,
+    //       },
+    //     },
+    //     { loader: 'css-loader' },
+    //     { loader: 'stylus-loader' },
+    //   ],
+    // },
     {
       test: /\.(sa|sc|c)ss$/,
       use: [
diff --git a/yarn.lock b/yarn.lock
index f6cfcd49f53..af72256071b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7,6 +7,11 @@
   resolved "https://registry.yarnpkg.com/@aashutoshrathi/word-wrap/-/word-wrap-1.2.6.tgz#bd9154aec9983f77b3a034ecaa015c2e4201f6cf"
   integrity sha512-1Yjs2SvM8TflER/OD3cOjhWWOZb58A2t7wpE2S9XfBYTiIl+XFhQG2bjy4Pu1I+EAlCNUzRDYDdFwFYUKvXcIA==
 
+"@adobe/css-tools@^4.0.1":
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/@adobe/css-tools/-/css-tools-4.2.0.tgz#e1a84fca468f4b337816fcb7f0964beb620ba855"
+  integrity sha512-E09FiIft46CmH5Qnjb0wsW54/YQd69LsxeKUOWawmws1XWvyFGURnAChH0mlr7YPFR1ofwvUQfcL0J3lMxXqPA==
+
 "@algolia/autocomplete-core@1.9.3":
   version "1.9.3"
   resolved "https://registry.yarnpkg.com/@algolia/autocomplete-core/-/autocomplete-core-1.9.3.tgz#1d56482a768c33aae0868c8533049e02e8961be7"
@@ -8456,7 +8461,7 @@ debug@2.6.9, debug@^2.6.0, debug@^2.6.9:
   dependencies:
     ms "2.0.0"
 
-debug@4, debug@4.3.4, debug@^4.0.0, debug@^4.0.1, debug@^4.1.0, debug@^4.1.1, debug@^4.3.3, debug@^4.3.4:
+debug@4, debug@4.3.4, debug@^4.0.0, debug@^4.0.1, debug@^4.1.0, debug@^4.1.1, debug@^4.3.2, debug@^4.3.3, debug@^4.3.4:
   version "4.3.4"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.4.tgz#1319f6579357f2338d3337d2cdd4914bb5dcc865"
   integrity sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==
@@ -19344,6 +19349,25 @@ stylis@4.2.0:
   resolved "https://registry.yarnpkg.com/stylis/-/stylis-4.2.0.tgz#79daee0208964c8fe695a42fcffcac633a211a51"
   integrity sha512-Orov6g6BB1sDfYgzWfTHDOxamtX1bE/zo104Dh9e6fqJ3PooipYyfJ0pUmrZO2wAvO8YbEyeFrkV91XTsGMSrw==
 
+stylus-loader@^7.1.3:
+  version "7.1.3"
+  resolved "https://registry.yarnpkg.com/stylus-loader/-/stylus-loader-7.1.3.tgz#1fdfa0d34e8c05a569bc0902e1ecdb857d764964"
+  integrity sha512-TY0SKwiY7D2kMd3UxaWKSf3xHF0FFN/FAfsSqfrhxRT/koXTwffq2cgEWDkLQz7VojMu7qEEHt5TlMjkPx9UDw==
+  dependencies:
+    fast-glob "^3.2.12"
+    normalize-path "^3.0.0"
+
+stylus@^0.59.0:
+  version "0.59.0"
+  resolved "https://registry.yarnpkg.com/stylus/-/stylus-0.59.0.tgz#a344d5932787142a141946536d6e24e6a6be7aa6"
+  integrity sha512-lQ9w/XIOH5ZHVNuNbWW8D822r+/wBSO/d6XvtyHLF7LW4KaCIDeVbvn5DF8fGCJAUCwVhVi/h6J0NUcnylUEjg==
+  dependencies:
+    "@adobe/css-tools" "^4.0.1"
+    debug "^4.3.2"
+    glob "^7.1.6"
+    sax "~1.2.4"
+    source-map "^0.7.3"
+
 supports-color@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"