diff --git a/src/connectedComponents/Viewer.js b/src/connectedComponents/Viewer.js
index d47081839..429272096 100644
--- a/src/connectedComponents/Viewer.js
+++ b/src/connectedComponents/Viewer.js
@@ -344,9 +344,14 @@ const _mapStudiesToThumbnails = function(studies) {
       } = displaySet;
 
       let imageId;
-      let altImageText = ' '; // modality
+      let altImageText;
 
-      if (displaySet.images && displaySet.images.length) {
+      if (displaySet.modality && displaySet.modality === 'SEG') {
+        // TODO: We want to replace this with a thumbnail showing
+        // the segmentation map on the image, but this is easier
+        // and better than what we have right now.
+        altImageText = 'SEG';
+      } else if (displaySet.images && displaySet.images.length) {
         const imageIndex = Math.floor(displaySet.images.length / 2);
 
         imageId = displaySet.images[imageIndex].getImageId();