Dysgerminoma. - Ref: Williams Gynae 3/e p765* Most common ovarian tumor in pregnancy (but in remains undiagnosed) - Serous cystadenoma.* Most Common benign tumor diagnosed in pregnancy - Dermoid cyst.* Overall most common ovarian tumor diagnosed in pregnancy - Dermoid cyst.* Most common malignant ovarian tumor detected during pregnancy - Dysgerminoma.* Germ cell Tumor with best prognosis - Dysgerminoma* Germ cell tumor with worst prognosis - endodermal sinus tumor* Germ cell tumor which has maximum bilaterality - Dysgerminoma* Germ cell tumor which presents as acute abdomen - Endodermal Sinus Tumor* Most common ovarian tumor to undergo torsion during pregnancy - Dermoid cyst.* Most common ovarian tumor to involve opposite ovary by metastasis - Granulosa cell tumor.* Most radiosensitive ovarian tumor - Dysgerminoma.. - Ref: Bailey & Love 24th/ed, p221* Most rapidly growing ovarian tumor - Yolk sac Tm- (Endodermal Sinus Tumor)Ovarian Tumor: Causing:* Pseudomyxoma peritonei- Mucinous cystadenoma/Micinous cystadenocarcinoma* Meigs syndrome- Ovarian fibroma* Pseudomeig's syndrome:- Brenner's tumor- Granulosa cell tumor- Thecoma* Ovarian tumor associated with hyperpyrexia and hypercalcemia- Mesonephroid tumor.* Ovarian tumor arising from epithelium of urinary tract- Brenner Tm* Feminizing tumors:- Granulosa cell tumor- Theca cell tumor- Fibromas* Virilising tumor:- Androblastoma- Hilus cell Tm- Gynadroblastoma- Adrenal cortical tumor* Largest benign ovarian tumor- Mucinous cyst adenoma* Tumor with lymphocytic infiltration:- Dysgerminoma.">