diff --git a/static/js/dicomViewer.js b/static/js/dicomViewer.js
index f7182ca1..e0e75712 100644
--- a/static/js/dicomViewer.js
+++ b/static/js/dicomViewer.js
@@ -674,11 +674,11 @@ export function loadCornerstone(main_element, db, images, annotations_to_load, l
                     });
                 }
             } else {
-                if (image_url.startsWith("wadouri")) {
+                if (image_url.startsWith("wadouri") || image_url.startsWith("base64")) {
                     cornerstone.loadAndCacheImage(image_url).then(function (image) {
                         loadCornerstoneThumb(image, id);
                     });
-                } else if ((!image_url.endsWith("dicom") && !image_url.endsWith("dcm")) || image_url.startsWith("base64")) {
+                } else if ((!image_url.endsWith("dicom") && !image_url.endsWith("dcm"))) {
                     img = $("<img />", {
                         src: image_url,
                         id: "thumb-image-" + id,