Yolk Sac Tumor (Testicular)

Yolk Sac Tumor (Testicular) is a rare type of cancer that affects the testicles, which are part of the male reproductive system. It usually occurs in young boys and men and is known for producing a substance called alpha-fetoprotein (AFP), which can be measured in the blood. This tumor grows quickly and can cause a painless lump or swelling in the testicle. Because it is a form of germ cell tumor, it arises from the cells that normally develop into sperm. Early detection is important as it can spread to other parts of the body if untreated. The main health impact is related to the tumor's growth and potential to spread, which can affect fertility and overall health.

Yolk Sac Tumor (Testicular), also known as endodermal sinus tumor, is a malignant germ cell tumor characterized by differentiation toward extraembryonic yolk sac structures. It is the most common testicular tumor in prepubertal males and often presents with elevated serum alpha-fetoprotein (AFP) levels due to tumor secretion. Histologically, it shows distinctive Schiller-Duval bodies and a reticular or microcystic pattern. The tumor arises from primitive germ cells that fail to differentiate normally, leading to aggressive local growth and potential metastasis. It is clinically significant due to its rapid progression and the need for prompt diagnosis and treatment. The tumor is highly sensitive to chemotherapy, which improves prognosis significantly.