diff --git a/src/nd2/structures.py b/src/nd2/structures.py
index 31026c2..623613f 100644
--- a/src/nd2/structures.py
+++ b/src/nd2/structures.py
@@ -422,7 +422,7 @@ def _from_meta_dict(cls, val: dict) -> ExtrudedShape:
         return cls(
             sizeZ=val.get("SizeZ") or val.get("sizeZ") or 0,
             basePoints=[
-                XYPoint(*val[f"BasePoints_{i}"].get("", []))
+                XYPoint(*val[f"BasePoints_{i}"].values())
                 for i in range(val.get("BasePoints_Size", 0))
             ],
         )
diff --git a/tests/test_rois.py b/tests/test_rois.py
index 8812ef7..d57a55a 100644
--- a/tests/test_rois.py
+++ b/tests/test_rois.py
@@ -1,6 +1,7 @@
 from pathlib import Path
 
 import nd2
+from nd2.structures import InterpType
 
 DATA = Path(__file__).parent / "data"
 
@@ -10,3 +11,16 @@ def test_rois():
         rois = f.rois.values()
         assert len(rois) == 18
         assert [r.id for r in rois] == list(range(1, 19))
+
+        roi1 = f.rois[1]
+        assert roi1.info.label == "rect bgrd"
+
+        roi16 = f.rois[16]
+        assert roi16.info.label == "S3:16 stim 3 poly"
+        assert roi16.info.interpType == InterpType.StimulationROI
+        assert roi16.animParams[0].extrudedShape.basePoints == [
+            (-0.05231780847932399, -0.10247210748706266),
+            (0.09780325689597874, 0.04522765038218665),
+            (0.030006646726487105, 0.11302426055167814),
+            (-0.0959013435882828, -0.05646726487205058),
+        ]