<prompt> Bilateral germ cell tumour is .DysgerminomaImmature teratomaEmbryonal cell carcinomaEndodermal sinus tumour  <response>: Ans. is c i.e. Embryonal cell carcinoma Friends, this is one of those type of questions where we will derive a correct answer by ruling out other options. Let see, Option a : Dysgerminoma They are bilateral in about 10 of cases. Option b : Immature teratoma In a premenopausal patient whose lesion appears to be confined to a single ovary, unilateral oophorectomy and surgical staging should be performed. For a postmenopausal patient, a total abdominal hysterectomy and bilateral salpingo-oophorectomy may he performed. Contralateral involvement is rare, and routine resection or wedge biopsy of the contralateral ovary is unnecessary. Coming on to Option c with embryonal cell carcinoma. It is a rare type of Germ cell tumor and so is the information available on at. The only information I could lay my hands was : Options c: Embryonal cell carcinoma The primary lesions tend to be large, and about two thirds are confined to one ovary at the time of diagnosis Option d : Endodermal Sinus Tumour EST It is unilateral in 100 of cases. Considering all above options I choose embryonal cell carcinoma as the option of choice I have provided you with all related references, you are free to have your opinion. 