AUTHOR=Ichikawa Jiro , Imada Hiroki , Kawasaki Tomonori , Haro Hirotaka TITLE=Opinion: the nature of primary and secondary synovial chondromatosis: importance of pathological findings JOURNAL=Frontiers in Oncology VOLUME=13 YEAR=2023 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2023.1281890 DOI=10.3389/fonc.2023.1281890 ISSN=2234-943X