<prompt> True about endodermal sinus tumors:a Schiller duval bodies seenb It is a benign tumourc HCGd It is seen in young individualse It is a malignant tumouracdbdeadead  <response>: Endodermal sinus tumorYolk sac tumor: Endodermal sinus yolk sac tumour is third most common malignant germ cell tumour of ovary affecting mostly children or young women. Age group 1420 years. Tumour is highly malignant and is most rapidly growing tumour of whole body. Histologically the pathognomic finding is Schiller - Duval bodies which is a single papilla lined by tumour cells with a central blood vessel. Due to high rate of growth, tumour usually presents with acute abdomen. Unilateral in 100 cases therefore biopsy of opposite ovary is contraindicated. Almost all cases are associated with raised AFP and Alpha 1 antitrypsin. It is the most deadly malignant ovarian germ cell tumor. Treatment: Chemotherapy. It has a high propensity for rapid growth, peritoneal spread and distant hematogenous dissemination to the lungs. 