Lambert–Eaton myasthenic syndrome

Lambert–Eaton myasthenic syndrome (LEMS) is a rare autoimmune disorder characterized by muscle weakness of the limbs. It is also known as myasthenic syndrome, Eaton–Lambert syndrome, and, when related to cancer, carcinomatous myopathy.

Source: Wikipedia — Lambert–Eaton myasthenic syndrome (CC BY-SA 4.0)