Cystadenoma occurs in the ovary and is called ovarian cystadenoma, which is divided into two types: plasmacytoma and mucinous. It is the most common type of benign ovarian tumor and usually requires surgery after detection. Most ovarian cystadenomas can be treated laparoscopically, and the indications for surgery of giant ovarian cystadenomas >15 cm in diameter are gradually expanding. Lei Manli et al. reported that a 3-cm incision was made on the pubic bone to first puncture and release the cystic fluid, and then the cystic wall was pulled out of the incision to remove the affected adnexa when the tumor shrank, the suprapubic incision was sutured, and then the pelvic and abdominal cavities were explored by placing a mirror at the umbilical port. Ovarian cystadenomas originate from cells covering the surface of the ovary and are histologically classified into plasmacytoma and mucinous cystadenoma. Ovarian cystadenoma is the most common benign tumor of the ovary, accounting for about 45% of primary benign tumors of the ovary, mainly seen in women of childbearing age, mostly unilateral and about 15% bilateral, and can be classified as plasmacytotic or mucinous according to its intracapsular components. For unmarried infertile patients surgery should preserve more ovarian cortex and retain ovarian function.