You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Schiller- Duval bodies are seen in and explain in detail?
(Yolk - sac tumour) (736 - HM 5th) (692- Basic pathology 8th)YOLK-SAC-TUMOUR (synonyms - Endo dermal sinus tumurs, orchioblastoma, Infantile embryonal carcinoma)* This characteristic tumour is the most common testicular tumour of infants and young children up to the age of 4 years* AFP levels are elevated in 100% cases of yolk sac tumoursMicroscopic - The tumour cells may form distinctive perivascular structures resembling the yolk sac or endodermal sinuses of the rat placenta called Schiller - Duval bodies* There may be presence of both intracellular and extra cellular PAS positive hyaline globulesCHORIOCARCINOMA - M/E - Characteristic feature is the identification of intimately related syncytiotrophoblast and cyto trophoblast without formation of definite placental type villiTERATOMA - Honey - combed areas and foci of cartilage and boneSEMINOMA - Commonest malignant tumour of the testis and corresponds to dysgerminoma in femaleM/F. shows lobules of monomorphic seminoma cells separated by delicate fibrous stroma containing lymphocytic infiltration