<prompt> Most common malignant germ cell ovarian tumor:Yolk sac tumorsDysgerminomaDermoid cystBrenners  <response>: Ans. b DysgerminomaRef. Shaws 15th ed, : 933Please refer to above explanation.YOLK SAC TUMORS Yolk sac tumors account for 20 of all malignant ovarian germ cell tumors Microscopically Schiller-Duval bodies are pathognomonic when present. 