Juvenile myasthenia gravis (MG) is a rare form of MG, an autoimmune disorder of the neuromuscular junction resulting in ocular manifestations or generalized weakness, with onset before 18 years of age. The disease is juvenile myasthenia gravis (MONDO_0018325, a Monarch Disease Ontology identifier). Also known as: childhood myasthenia gravis, juvenile acquired myasthenia, juvenile autoimmune myasthenia gravis, myasthenia gravis of childhood, paediatric myasthenia gravis, pediatric myasthenia gravis.