diff --git a/anatomy/static/js/anatomy.js b/anatomy/static/js/anatomy.js
index 11e2645b..88515b09 100644
--- a/anatomy/static/js/anatomy.js
+++ b/anatomy/static/js/anatomy.js
@@ -635,6 +635,11 @@ async function setUpDicom3d(element) {
       // dicomViewer helper (it expects a jQuery element).
       console.warn('setUpDicom3d: contains web-image(s) — falling back to 2D loader');
       try {
+        // Remove any partially-created dv3d DOM and ensure the element is a
+        // clean container for the 2D viewer. This ensures the `.canvas-panel`
+        // appended by `loadCornerstone` overlays exactly the element area.
+        try { element.innerHTML = ""; } catch (e) { $(element).empty(); }
+        element.style.position = element.style.position || 'relative';
         // annotations are not available in this scope in the 3d code path; pass
         // undefined for annotations and let the loader handle it.
         dicomViewer.loadCornerstone($(element), null, images, undefined, images.length > 5);
@@ -676,6 +681,8 @@ async function setUpDicom3d(element) {
       // URLs, fallback to the 2D cornerstone loader which handles web images.
       console.warn('viewport.setStack failed, attempting 2D fallback:', err);
       try {
+        try { element.innerHTML = ""; } catch (e) { $(element).empty(); }
+        element.style.position = element.style.position || 'relative';
         dicomViewer.loadCornerstone($(element), null, images, undefined, images.length > 5);
         element._cornerstone3d = { fallback: 'cornerstone2d', imageCount: images.length };
         return element._cornerstone3d;
diff --git a/rad/static/css/anatomy.css b/rad/static/css/anatomy.css
index 5c8693e4..2840f33d 100644
--- a/rad/static/css/anatomy.css
+++ b/rad/static/css/anatomy.css
@@ -186,7 +186,7 @@ button a {
 
 #dicom-image {
   width: 100%;
-  height: 600px;
+/*   height: 600px; */
 }
 
 .dicom-viewer {