Cystic Echinococcosis is a parasitic infection caused by the larval stage of the Echinococcus granulosus tapeworm. This disease primarily affects the liver and lungs, forming fluid-filled cysts that can grow over time. Humans typically become infected through contact with dogs or contaminated food and water. Symptoms may vary depending on the cyst's location and size, often remaining asymptomatic for years. If the cysts rupture, they can lead to severe complications. Diagnosis is usually made through imaging techniques like ultrasound or CT scans, and treatment often involves surgical removal of the cysts or medication to manage the infection.