Alveolar hydatid disease, also known as alveolar echinococcosis, is a rare but serious parasitic infection caused by the tapeworm Echinococcus multilocularis. This disease primarily affects the liver and can cause significant organ damage if not treated promptly. Some synonyms for alveolar hydatid disease include alveolar echinococcosis, hepatic alveolar echinococcosis, and ALD. The term alveolar refers to small, air-filled sacs in the lungs or other organs, which is a characteristic feature of the disease. Hydatid refers to the cyst-like structures that the tapeworm forms in the affected organ. Despite being rare, it is important to be aware of the symptoms and treatment options for alveolar hydatid disease in order to ensure a prompt and effective response.