<prompt> Which of the following is the most radiosensitive ovarian tumors:DysgerminomaDermoid cystSerous cystadenomaEndodermal sinus tumour  <response>: Below the age of 20 years 60 of the tumours are of germ cell origin and in girls under the age of 10 years almost 85 are of germ cell origin and are invariably malignant.Dysgerminoma is the most common malignant germ cell tumour accounting for about 40 of all ovarian cancers of germ cell origin.Dysgerminomas are the most common malignant germ cell tumours of the ovary and have been considered the female - equivalent of seminoma.Most common germ cell tumour of ovary is dermoid cyst mature teratoma. It is benign in nature.Remember: Most common ovarian tumour overall Epithelial cell tumour. Most common tumour in young woman is Germ cell tumour. Most common malignant tumour of ovary Serous cystadenocarcinoma. Most common benign tumour of ovary overall Dermoid cyst. Most common benign epithelial tumor of ovary Serous cystadenoma. Most common germ cell tumour Mature teratoma Dermoid cyst. Most common malignant GCT Dysgerminoma. Most common ovarian tumour in pregnancy but in remains undiagnosed Serous cystadenoma. Most Common benign tumour diagnosed in pregnancy Dermoid cyst. Overall most common ovarian tumour diagnosed in pregnancy Dermoid cyst. Most common malignant ovarian tumor detected during pregnancy Dysgerminoma. Germ cell Tumor with best pregnosis Dyserminoma Germ cell tumor with worst prognosis- endodermal sinus tumor Germ cell tumor which has maximum bilaterality Dysgerminoma Germ cell tumor which presents as accute abdomen- Endodermal Sinus Tumor Most common ovarian tumour to undergo torsion during pregnancy Dermoid cyst. Most common ovarian tumour to involve opposite ovary by metastasis Granulosa cell tumour. Most radiosensitive ovarian tumour Dysgerminoma. Most rapidly growing ovarian tumour Yolk sac Tm- Endodermal Sinus Tumor Most connective tissue tumour Fibroma.Ovarian Tumour: Causing: Pseudomyxoma peritonei Mucinous cystadenoma. Meigs syndrome Ovarian fibroma Pseudomeigs syndrome: Brenners tumour Granulosa cell tumour Thecoma Ovarian tumour associated with hyperpyrexia and hypercalcemia Mesonephroid tumour. Ovarian tumour arising from epithelium of urinary tract Brenner Tm Feminizing tumours: Granulosa cell tumour Theca cell tumour Fibromas Virilising tumour: Androblastoma Hilus cell Tm Gynadroblastoma Adrenal cortical tumour Largest benign ovarian Tm Mucinous cyst adenoma Mucinous tumours are associated with: Dermoid cyst MBD Brenners tumour Tumour with lymphocytic infilteration: 