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Germ cell tumors (GCTs) are a diverse group of neoplasms originating from germ cells, which are responsible for producing eggs in females and sperm in males. These tumors can arise in the gonads (testes and ovaries) or in extragonadal sites such as the mediastinum, brain, and retroperitoneum. Germ cell tumors can be benign or malignant, with malignant forms including seminomas, non-seminomatous germ cell tumors, yolk sac tumors, choriocarcinomas, and teratomas.

The exact cause of GCTs is not fully understood, but genetic predisposition, abnormal germ cell development, and environmental factors may contribute. Symptoms vary depending on tumor location and type. Testicular GCTs often present as painless testicular swelling, while ovarian or extragonadal tumors may cause abdominal pain, swelling, or organ-specific symptoms. Diagnosis involves imaging studies such as ultrasound, CT, or MRI, and tumor marker evaluation, including alpha-fetoprotein (AFP), beta-human chorionic gonadotropin (β-hCG), and lactate dehydrogenase (LDH).

Management is tailored to tumor type, location, and stage. Surgery is the primary treatment for localized tumors, often complemented by chemotherapy or radiation therapy for advanced disease. Germ cell tumors are highly sensitive to treatment, and early detection significantly improves prognosis. Lifelong follow-up is important to monitor for recurrence and long-term treatment effects.