“…In this case, the cell line was established from a sarcomatous mural nodule of a borderline mucinous cystadenoma. In rare instances, cystic ovarian mucinous tumors contain spindle cell mural nodules (SCMN) (12–31) . These SCMN have been reported to include sarcomas (12,18–21,27) , reactive sarcoma‐like nodules (13,17,24,29) , anaplastic carcinomas (14–18,23,25,26,30,31) , combined sarcoma‐like nodules and carcinomas (17,22) , and leiomyomas (20,23,28) .…”