Masatoshi NAKAGAWA, et al. “Successful Preoperative Diagnosis of Biliary Cystadenoma With Mesenchymal Stroma and Its Characteristic Imaging Features: Report of Two Cases”. Turkish Journal of Gastroenterology, vol. 22, no. 6, July 2019, pp. 631-5, https://tjg.avesjournals.com/index.php/tjg/article/view/2584.