<prompt> Torsion of ovary is most commonly seen in -Dermoid cystGranulosa celltumourDysgerminomaYolk sactumour  <response>: Ans. is a i.e., Dermoid cyst The most common are the epithelial cell tumours forming 80 fo all tumours. 80 are benign and 20 are malignant tumours. Of all the malignant tumours 90 are epithelial in origin, 80 are primary in the ovary and 20 are secondary from breasts, git and colon.o Most common ovarian tumour over all - Epithelial cell tumouro iMost common tumour in young women - Germ cell tumour - Shaw 15the, p376o Most common malignant tumour of the ovary - Serous cvstadenocarcinomao Most common benign tumour of the ovary over all - Dermoid cyst - Williams Gynae 1e, p214o Most common benign epithelial tumour of the ovary - Serous cystadenoma - Jeffcoate 7e, p531o Most common germ cell tumour of the ovary - Mature teratoma Dermoid cysto Most common malignant germ cell tumour of the ovary - Dysgerminomao Most common ovarian tumour in pregnancy remains undiagnosed - Serous cystadenomao Most common benign tumour diagnosed in pregnancy - Dermoid cysto Most common tumour diagnosed in pregnancy over all - Dermoid cysto Most common malignant tumour diagnosed in pregnancy - Dysgerminomao Most common ovarian tumour to undergo torsion in pregnancy - Dermoid cysto Most common tumour to involve opposite ovary by metastasis - Granulosa cell tumouro Most radiosensitive ovarian tumour - Dysgerminoma - Bailey and Love 24the, p221o Most rapidly growing ovarian tumour - Yolk sac tumouro Most common connective tissue tumour - fibroma 