diff --git a/atlas/filters.py b/atlas/filters.py
index 9daa9e95..7fc6bd54 100755
--- a/atlas/filters.py
+++ b/atlas/filters.py
@@ -1,4 +1,6 @@
 import django_filters
+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Layout, Div
 
 from .models import (
     Case,
@@ -364,9 +366,10 @@ class NormalCaseFilter(django_filters.FilterSet):
         # Use the global Examination and Modality querysets from the Series model
         from generic.models import Examination, Modality
 
-        # Set up the actual querysets for the filters
-        self.base_filters.get("examination").queryset = Examination.objects.all()
-        self.base_filters.get("modality").queryset = Modality.objects.all()
+        # We'll set the actual querysets for the filters after applying
+        # any NormalCase queryset restrictions for the current user so
+        # that the choices only include examinations/modalities that
+        # actually have NormalCase records available.
 
         # If not an atlas editor restrict to cases authored by the user or open access cases
         if request is not None and not request.user.groups.filter(name="atlas_editor").exists():
@@ -376,8 +379,47 @@ class NormalCaseFilter(django_filters.FilterSet):
                 queryset = NormalCase.objects.select_related("case")
             queryset = queryset.filter((Q(case__author__id=request.user.id) | Q(case__open_access=True)))
 
+        # Determine the NormalCase queryset we'll use to build choices
+        nc_qs = queryset if queryset is not None else NormalCase.objects.all()
+
+        # Limit examination and modality choices to those present on the
+        # available NormalCase records (respecting user restrictions).
+        try:
+            exam_ids = nc_qs.values_list("examination_id", flat=True)
+            mod_ids = nc_qs.values_list("modality_id", flat=True)
+            self.base_filters.get("examination").queryset = Examination.objects.filter(id__in=exam_ids).distinct()
+            self.base_filters.get("modality").queryset = Modality.objects.filter(id__in=mod_ids).distinct()
+        except Exception:
+            # Fallback to all if something goes wrong
+            self.base_filters.get("examination").queryset = Examination.objects.all()
+            self.base_filters.get("modality").queryset = Modality.objects.all()
+
         super(NormalCaseFilter, self).__init__(data=data, queryset=queryset, prefix=prefix, request=request)
 
+        # Attach a Crispy FormHelper to render the filter form as a
+        # horizontal Bootstrap grid. We set `form_tag=False` because the
+        # template already provides the <form> element.
+        try:
+            helper = FormHelper()
+            helper.form_method = "get"
+            helper.form_tag = False
+            helper.form_class = "row g-2 align-items-end"
+            helper.layout = Layout(
+                Div(
+                    Div("examination", css_class="col-md-4"),
+                    Div("modality", css_class="col-md-4"),
+                    Div("age_days", css_class="col-md-2"),
+                    Div("min_age", css_class="col-md-2"),
+                    Div("max_age", css_class="col-md-2"),
+                    css_class="row g-2 align-items-end",
+                )
+            )
+            # Assign helper to the generated form instance
+            if hasattr(self, 'form') and self.form is not None:
+                self.form.helper = helper
+        except Exception:
+            pass
+
     def filter_min_age(self, queryset, name, value):
         try:
             days = int(float(value) * 365.25)
diff --git a/atlas/templates/atlas/normals_list.html b/atlas/templates/atlas/normals_list.html
index 37b6eb51..ed51f5f7 100644
--- a/atlas/templates/atlas/normals_list.html
+++ b/atlas/templates/atlas/normals_list.html
@@ -9,12 +9,7 @@
     <div class="row mb-3">
       <div class="col-md-4">
         <form method="get" class="form-inline">
-          {% for field in filter.form.visible_fields %}
-            <div class="mb-2">
-              {{ field.label_tag }}
-              {{ field }}
-            </div>
-          {% endfor %}
+          {% crispy filter.form %}
           <div class="mb-2">
             <button class="btn btn-primary" type="submit">Filter</button>
             <a class="btn btn-link" href="?">Clear</a>