<prompt> All of the following are not false about seminomas, except:Most common type of germ cell tumorSchiller-Duval bodies are commonly seenSerum HCG levels are elevatedSpermatocytic seminomas are usually slow growing  <response>: Most common germ cell tumor arising from testicular tissue - seminomas. Serum human chorionic gonadotropin hCG levels are elevated, though not to the extent seen in patients with choriocarcinoma. Immunohistochemical markers of seminoma: OCT 34 KIT PLAP Placental Alkaline Phosphatase Peak incidence is in the 4th decade of life. Identical tumour in the ovary is dysgerminoma, in the pineal gland-germinoma. Spermatocytic seminomas are uncommon, slow-growing tumuors, generally seen in older individuals usual more than 65 years old. Spermatocytic tumours most often do not metastasize, and have good prognosis when treated by surgical resection. Schiller-Duval bodies are seen in Yolk Sac tumour. 