diff --git a/package-lock.json b/package-lock.json
index 9cb8f0047..090351e96 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6174,7 +6174,7 @@
       }
     },
     "node_modules/niivue-react": {
-      "resolved": "git+ssh://git@github.com/niivue/niivue-react.git#e07626fcfe5eb2dc2907fce91c87bfde8848a40e",
+      "resolved": "git+ssh://git@github.com/niivue/niivue-react.git#9ef21bd3f8ea810b63f45b49155f71bf7f8bf255",
       "peerDependencies": {
         "@niivue/niivue": "^0.39.0",
         "react": "^17 || ^18",
diff --git a/src/api/model.ts b/src/api/model.ts
index 0463025f4..c347e360f 100644
--- a/src/api/model.ts
+++ b/src/api/model.ts
@@ -326,14 +326,14 @@ export const fileViewerMap: any = {
   gif: "ImageDisplay",
   dcm: "DcmDisplay",
   default: "CatchallDisplay",
-  nii: "DcmDisplay",
+  nii: "NiiVueDisplay",
   gz: "CatchallDisplay",
-  mgz: "XtkDisplay",
+  mgz: "NiiVueDisplay",
   fsm: "XtkDisplay",
   crv: "XtkDisplay",
   smoothwm: "XtkDisplay",
   pial: "XtkDisplay",
-  "nii.gz": "DcmDisplay",
+  "nii.gz": "NiiVueDisplay",
 };
 
 // Description: get file type by file extension
diff --git a/src/components/Preview/displays/NiiVueDisplay.module.css b/src/components/Preview/displays/NiiVueDisplay.module.css
new file mode 100644
index 000000000..091241a60
--- /dev/null
+++ b/src/components/Preview/displays/NiiVueDisplay.module.css
@@ -0,0 +1,12 @@
+.container {
+  width: 100%;
+  height: 100%;
+}
+
+
+.controlBar {
+  position: absolute;
+  top: -10px;
+  height: 8px;
+
+}
diff --git a/src/components/Preview/displays/NiiVueDisplay.tsx b/src/components/Preview/displays/NiiVueDisplay.tsx
new file mode 100644
index 000000000..f20e9124b
--- /dev/null
+++ b/src/components/Preview/displays/NiiVueDisplay.tsx
@@ -0,0 +1,83 @@
+import React from "react";
+import { IFileBlob } from "../../../api/model.ts";
+import { NVROptions, NVRVolume } from "niivue-react/src/model.ts";
+import SizedNiivueCanvas from "../../SizedNiivueCanvas";
+import { SLICE_TYPE } from "@niivue/niivue";
+import styles from "./NiiVueDisplay.module.css";
+
+type NiiVueDisplayProps = {
+  fileItem: IFileBlob;
+};
+
+type PreviewOptions = Required<
+  Pick<
+    NVROptions,
+    | "sliceType"
+    | "isColorbar"
+    | "backColor"
+    | "isRadiologicalConvention"
+    | "crosshairWidth"
+  >
+>;
+
+const SLICE_TYPES = {
+  A: SLICE_TYPE.AXIAL,
+  C: SLICE_TYPE.CORONAL,
+  S: SLICE_TYPE.SAGITTAL,
+  M: SLICE_TYPE.MULTIPLANAR,
+};
+
+const NiiVueDisplay: React.FC<NiiVueDisplayProps> = ({ fileItem }) => {
+  const [colormap, setColormap] = React.useState("gray");
+  const [sliceTypeName, setSliceTypeName] =
+    React.useState<keyof typeof SLICE_TYPES>("M");
+
+  const volumes: NVRVolume[] = [];
+
+  const options: PreviewOptions = {
+    backColor: [0, 0, 0],
+    isRadiologicalConvention: true,
+    sliceType: SLICE_TYPES[sliceTypeName],
+    isColorbar: false,
+    crosshairWidth: sliceTypeName === "M" ? 0.5 : 0,
+  };
+
+  if (fileItem.blob !== undefined && fileItem.file !== undefined) {
+    volumes.push({
+      // NiiVue gets the file extension from name
+      name: fileItem.file.data.fname,
+      url: window.URL.createObjectURL(fileItem.blob),
+      colormap: colormap,
+    });
+  }
+
+  const toggleColormap = () => {
+    setColormap(colormap === "gray" ? "freesurfer" : "gray");
+  };
+
+  const rotateSliceType = () => {
+    const names = Object.keys(SLICE_TYPES) as (keyof typeof SLICE_TYPES)[];
+    const i = names.indexOf(sliceTypeName);
+    const next = i + 1 >= names.length ? 0 : i + 1;
+    setSliceTypeName(names[next]);
+  };
+
+  return (
+    <>
+      {volumes.length === 0 ? (
+        <h1>error</h1>
+      ) : (
+        <div className={styles.container}>
+          <div className={styles.controlBar}>
+            <button onClick={toggleColormap}>{colormap}</button>
+            <button onClick={rotateSliceType}>{sliceTypeName}</button>
+          </div>
+          <SizedNiivueCanvas size={8} volumes={volumes} options={options} />
+        </div>
+      )}
+    </>
+  );
+};
+
+const MemoedNiiVueDisplay = React.memo(NiiVueDisplay);
+export default MemoedNiiVueDisplay;
diff --git a/src/components/Preview/displays/ViewerDisplay.tsx b/src/components/Preview/displays/ViewerDisplay.tsx
index fc372ee6d..77e656904 100644
--- a/src/components/Preview/displays/ViewerDisplay.tsx
+++ b/src/components/Preview/displays/ViewerDisplay.tsx
@@ -9,6 +9,7 @@ import {
   PdfDisplay,
   XtkDisplay,
   TextDisplay,
+  NiiVueDisplay,
 } from "./index";
 import { ActionState } from "../FileDetailView";
 
@@ -21,6 +22,7 @@ const components = {
   PdfDisplay,
   XtkDisplay,
   TextDisplay,
+  NiiVueDisplay,
 };
 
 interface ViewerDisplayProps {
diff --git a/src/components/Preview/displays/index.ts b/src/components/Preview/displays/index.ts
index cc921eea2..10f7d292f 100644
--- a/src/components/Preview/displays/index.ts
+++ b/src/components/Preview/displays/index.ts
@@ -7,3 +7,4 @@ export { default as DcmDisplay } from "./DcmDisplay";
 export { default as PdfDisplay } from "./PdfDisplay";
 export { default as XtkDisplay } from "./XtkDisplay";
 export { default as TextDisplay } from "./TextDisplay";
+export { default as NiiVueDisplay } from "./NiiVueDisplay.tsx";
diff --git a/src/components/VisualDatasets/components/SizedNiivueCanvas.module.css b/src/components/SizedNiivueCanvas/index.module.css
similarity index 100%
rename from src/components/VisualDatasets/components/SizedNiivueCanvas.module.css
rename to src/components/SizedNiivueCanvas/index.module.css
diff --git a/src/components/VisualDatasets/components/SizedNiivueCanvas.tsx b/src/components/SizedNiivueCanvas/index.tsx
similarity index 95%
rename from src/components/VisualDatasets/components/SizedNiivueCanvas.tsx
rename to src/components/SizedNiivueCanvas/index.tsx
index 57bb937de..a8b94f23e 100644
--- a/src/components/VisualDatasets/components/SizedNiivueCanvas.tsx
+++ b/src/components/SizedNiivueCanvas/index.tsx
@@ -4,7 +4,7 @@ import {
   NiivueCanvasProps,
   NiivueCanvas,
 } from "niivue-react/src/NiivueCanvas.tsx";
-import styles from "./SizedNiivueCanvas.module.css";
+import styles from "./index.module.css";
 
 /**
  * Type emitted by Niivue.onLocationChange
@@ -16,8 +16,8 @@ type CrosshairLocation = {
 };
 
 type SizedNiivueCanvasProps = NiivueCanvasProps & {
-  size: number;
-  isScaling: boolean;
+  size?: number;
+  isScaling?: boolean;
   onLocationChange?: (location: CrosshairLocation) => void;
 };
 
@@ -69,7 +69,7 @@ const SizedNiivueCanvas: React.FC<SizedNiivueCanvasProps> = ({
   const baseTextHeight = isScaling
     ? 0.06
     : textHeightModel(canvasWidth, canvasHeight);
-  const textHeight = (size / 10) * baseTextHeight;
+  const textHeight = ((size || 10) / 10) * baseTextHeight;
   const fullOptions = options ? { ...options, textHeight } : { textHeight };
 
   const fullOnStart = (nv: Niivue) => {
@@ -132,4 +132,4 @@ function textHeightModel(canvasWidth: number, canvasHeight: number): number {
 }
 
 export type { CrosshairLocation };
-export { SizedNiivueCanvas };
+export default SizedNiivueCanvas;
diff --git a/src/components/VisualDatasets/index.tsx b/src/components/VisualDatasets/index.tsx
index f191be3e4..34daaca7b 100644
--- a/src/components/VisualDatasets/index.tsx
+++ b/src/components/VisualDatasets/index.tsx
@@ -34,10 +34,9 @@ import { DEFAULT_OPTIONS } from "./defaults.ts";
 import preval from "preval.macro";
 import HeaderOptionBar from "./components/HeaderOptionBar.tsx";
 import FeedButton from "./components/FeedButton.tsx";
-import {
+import SizedNiivueCanvas, {
   CrosshairLocation,
-  SizedNiivueCanvas,
-} from "./components/SizedNiivueCanvas.tsx";
+} from "../SizedNiivueCanvas/index";
 import { Problem, VisualDataset } from "./types.ts";
 import VisualDatasetsClient from "./client.tsx";
 import ProblemsManager from "./problems.ts";