diff --git a/pageindex/retrieve.py b/pageindex/retrieve.py
index 55c38509c..6ceb14df8 100644
--- a/pageindex/retrieve.py
+++ b/pageindex/retrieve.py
@@ -56,16 +56,17 @@ def _get_pdf_page_content(doc_info: dict, page_nums: list[int]) -> list[dict]:
 def _get_md_page_content(doc_info: dict, page_nums: list[int]) -> list[dict]:
     """
     For Markdown documents, 'pages' are line numbers.
-    Find nodes whose line_num falls within [min(page_nums), max(page_nums)] and return their text.
+    Return text for nodes whose line_num matches one of the requested numbers.
+    Mirrors the PDF branch: '3,8' returns lines 3 and 8, not lines 3..8.
     """
-    min_line, max_line = min(page_nums), max(page_nums)
+    wanted = set(page_nums)
     results = []
     seen = set()
 
     def _traverse(nodes):
         for node in nodes:
             ln = node.get('line_num')
-            if ln and min_line <= ln <= max_line and ln not in seen:
+            if ln in wanted and ln not in seen:
                 seen.add(ln)
                 results.append({'page': ln, 'content': node.get('text', '')})
             if node.get('nodes'):
diff --git a/tests/test_retrieve_pages.py b/tests/test_retrieve_pages.py
new file mode 100644
index 000000000..b1cd9e170
--- /dev/null
+++ b/tests/test_retrieve_pages.py
@@ -0,0 +1,54 @@
+"""Regression tests for pageindex.retrieve page selection."""
+import json
+
+from pageindex.retrieve import get_page_content
+
+
+def _docs():
+    """Markdown and PDF documents with headings/pages at the same positions."""
+    return {
+        'D_MD': {
+            'type': 'md',
+            'structure': [
+                {'line_num': 5, 'text': 'L5', 'nodes': []},
+                {'line_num': 10, 'text': 'L10', 'nodes': []},
+                {'line_num': 50, 'text': 'L50', 'nodes': []},
+                {'line_num': 100, 'text': 'L100', 'nodes': []},
+            ],
+        },
+        'D_PDF': {
+            'type': 'pdf',
+            'pages': [
+                {'page': 5, 'content': 'P5'},
+                {'page': 10, 'content': 'P10'},
+                {'page': 50, 'content': 'P50'},
+                {'page': 100, 'content': 'P100'},
+            ],
+        },
+    }
+
+
+def _pages(result_json):
+    return sorted(r['page'] for r in json.loads(result_json))
+
+
+def test_md_comma_returns_only_requested_pages():
+    docs = _docs()
+    assert _pages(get_page_content(docs, 'D_MD', '5,100')) == [5, 100]
+
+
+def test_md_and_pdf_agree_on_comma_separated_pages():
+    docs = _docs()
+    md = _pages(get_page_content(docs, 'D_MD', '5,100'))
+    pdf = _pages(get_page_content(docs, 'D_PDF', '5,100'))
+    assert md == pdf == [5, 100]
+
+
+def test_md_range_still_returns_nodes_inside_range():
+    docs = _docs()
+    assert _pages(get_page_content(docs, 'D_MD', '5-50')) == [5, 10, 50]
+
+
+def test_md_single_page_returns_just_that_node():
+    docs = _docs()
+    assert _pages(get_page_content(docs, 'D_MD', '50')) == [50]