diff --git a/siibra/core/region.py b/siibra/core/region.py
index a1ff991e9..caa0e8afd 100644
--- a/siibra/core/region.py
+++ b/siibra/core/region.py
@@ -877,9 +877,21 @@ def vol_to_id_dict(vol: VolumeSrc):
                     for parcvol in parc_volumes
                     if parcvol.volume_type == "neuroglancer/precomputed"
                     and parcvol.space is space]
-                map_idx = self.index.map
-                if map_idx is not None:
-                    pev.has_annotation.visualized_in = vol_to_id_dict(ng_parc_volumes[map_idx])
+
+                # self.index.label can sometimes be None. e.g. "basal forebrain"
+                # in such a case, do not populate visualized in
+                if self.index.label is not None:
+
+                    # self.index.map can sometimes be None, but label is defined
+                    if self.index.map is None:
+
+                        # In rare instances, e.g. julich brain 2.9, "Ch 123 (Basal Forebrain)"
+                        # self.index.map is undefined (expect a single volume?)
+                        # but there exist multiple volumes (in the example, one for left/ one for right hemisphere)
+                        if len(ng_parc_volumes) == 1:
+                            pev.has_annotation.visualized_in = vol_to_id_dict(ng_parc_volumes[0])
+                    else:
+                        pev.has_annotation.visualized_in = vol_to_id_dict(ng_parc_volumes[self.index.map])
             except IndexError:
                 pass
                 
diff --git a/test/core/test_region.py b/test/core/test_region.py
index 294992c4e..280437170 100644
--- a/test/core/test_region.py
+++ b/test/core/test_region.py
@@ -1,6 +1,7 @@
 import unittest
 from unittest.mock import MagicMock
 import pytest
+import re
 
 from siibra import parcellations, spaces, retrieval
 from siibra.core.region import Region
@@ -161,5 +162,19 @@ def test_detail_region(parc_spec,region_spec,space_spec,expect_raise):
     assert model.has_annotation is not None
     assert model.has_annotation.best_view_point is not None
 
+has_inspired_by = [
+    ("julich 2.9", "hoc1 left", "mni152"),
+    ("long bundle", "Left short cingulate fibres", "mni152")
+]
+
+@pytest.mark.parametrize('parc_spec, region_spec, space_spec', has_inspired_by)
+def test_has_inspired_by(parc_spec, region_spec, space_spec):
+    p = siibra.parcellations[parc_spec]
+    r = p.decode_region(region_spec)
+    model = r.to_model(space=siibra.spaces[space_spec])
+    assert model.has_annotation.visualized_in is not None, f"expecting has_annotation.visualized_in is defined"
+    assert re.match(r"^precomputed:\/\/", model.has_annotation.visualized_in["@id"]), f"expecting has_annotation.visualized_in starts with precomputed://"
+
+
 if __name__ == "__main__":
     unittest.main()