diff --git a/extensions/default/src/DicomWebDataSource/index.js b/extensions/default/src/DicomWebDataSource/index.js
index 1db6782ee..d18a13f87 100644
--- a/extensions/default/src/DicomWebDataSource/index.js
+++ b/extensions/default/src/DicomWebDataSource/index.js
@@ -89,10 +89,11 @@ function createDicomWebApi(dicomWebConfig, UserAuthenticationService) {
   const implementation = {
     initialize: ({ params, query }) => {
       const { StudyInstanceUIDs: paramsStudyInstanceUIDs } = params;
-      const queryStudyInstanceUIDs = query.get('StudyInstanceUIDs');
+      const queryStudyInstanceUIDs = query.getAll('StudyInstanceUIDs');
 
       const StudyInstanceUIDs =
-        queryStudyInstanceUIDs || paramsStudyInstanceUIDs;
+        queryStudyInstanceUIDs.length && queryStudyInstanceUIDs ||
+        paramsStudyInstanceUIDs;
       const StudyInstanceUIDsAsArray =
         StudyInstanceUIDs && Array.isArray(StudyInstanceUIDs)
           ? StudyInstanceUIDs
diff --git a/extensions/default/src/Panels/PanelStudyBrowser.tsx b/extensions/default/src/Panels/PanelStudyBrowser.tsx
index 72fed50ea..3d97f90d4 100644
--- a/extensions/default/src/Panels/PanelStudyBrowser.tsx
+++ b/extensions/default/src/Panels/PanelStudyBrowser.tsx
@@ -61,7 +61,19 @@ function PanelStudyBrowser({
         };
       });
       if (isMounted.current) {
-        setStudyDisplayList(actuallyMappedStudies);
+        setStudyDisplayList(prevArray => {
+          const ret = [...prevArray];
+          for (const study of actuallyMappedStudies) {
+            if (
+              !prevArray.find(
+                it => it.studyInstanceUid === study.studyInstanceUid
+              )
+            ) {
+              ret.push(study);
+            }
+          }
+          return ret;
+        });
       }
     }
 
diff --git a/extensions/measurement-tracking/src/panels/PanelStudyBrowserTracking/PanelStudyBrowserTracking.tsx b/extensions/measurement-tracking/src/panels/PanelStudyBrowserTracking/PanelStudyBrowserTracking.tsx
index 655e238b2..9f7cde53d 100644
--- a/extensions/measurement-tracking/src/panels/PanelStudyBrowserTracking/PanelStudyBrowserTracking.tsx
+++ b/extensions/measurement-tracking/src/panels/PanelStudyBrowserTracking/PanelStudyBrowserTracking.tsx
@@ -109,7 +109,19 @@ function PanelStudyBrowserTracking({
         };
       });
 
-      setStudyDisplayList(actuallyMappedStudies);
+      setStudyDisplayList(prevArray => {
+        const ret = [...prevArray];
+        for (const study of actuallyMappedStudies) {
+          if (
+            !prevArray.find(
+              it => it.studyInstanceUid === study.studyInstanceUid
+            )
+          ) {
+            ret.push(study);
+          }
+        }
+        return ret;
+      });
     }
 
     StudyInstanceUIDs.forEach(sid => fetchStudiesForPatient(sid));