Pseudo-Meigs syndrome secondary to endodermal sinus tumor

Ovarian tumors are the most common gynecological tumors seen in girls. Approximately 60–70% of them are germ cell tumors. Pseudo-Meigs syndrome is characterized by the presence of pelvic tumoral mass (benign or malign), pleural effusion, and massive acid. If the tumor is removed, acid and hydrothorax disappear. Endodermal sinus (yolk sac) tumor is a very rare cause in the diagnosis of Pseudo-Meigs syndrome, and only a few cases have been reported. This case is one of the rare cases presenting with Pseudo-Meigs syndrome and pathologically diagnosed as yolk sac tumor.