Isolated splenic metastasis presenting at diagnosis of HER2-positive de novo metastatic breast cancer: a case report. - Yoshioka, Maika; Shimoda, Masafumi; Abe, Kaori; Masunaga, Nanae; Tsukabe, Masami; Yoshinami, Tetsuhiro; Sota, Yoshiaki; Miyake, Tomohiro; Tanei, Tomonori; Shimazu, Kenzo (Journal of Surgical Case Reports, 2025)