diff --git a/src/views/trials/trials-panel/reading/dicoms/tools/Bidirectional/renderToolData.js b/src/views/trials/trials-panel/reading/dicoms/tools/Bidirectional/renderToolData.js
index 03925d59..1d209e8d 100644
--- a/src/views/trials/trials-panel/reading/dicoms/tools/Bidirectional/renderToolData.js
+++ b/src/views/trials/trials-panel/reading/dicoms/tools/Bidirectional/renderToolData.js
@@ -156,7 +156,7 @@ const getTextBoxText = (data, rowPixelSpacing, colPixelSpacing) => {
   }
 
   const lengthText = ` L ${data.longestDiameter}${suffix}`
-  const widthText = ` W ${data.shortestDiameter}${suffix}`
+  const widthText = ` S ${data.shortestDiameter}${suffix}`
 
   const { labels } = data