AUTHOR=Deng Xiaofeng , Huang Qian , Xie Bangfang , Huang Hailong , Chen Jianguo TITLE=A rare case report of primary ovarian carcinoid presenting with constipation JOURNAL=Frontiers in Oncology VOLUME=15 YEAR=2025 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2025.1489978 DOI=10.3389/fonc.2025.1489978 ISSN=2234-943X