Cellosaurus Disease Terminology Syndrome Rare Non-Neoplastic Disorder Congenital Myasthenic Syndrome Congenital Myasthenic Syndrome A group of rare genetic neuromuscular disorders characterized by neuromuscular junction defects. The defects are classified as presynaptic, synaptic, or postsynaptic. Signs and symptoms include muscle weakness, easy fatigability, feeding and respiratory difficulties, and scoliosis. Congenital Myasthenic Syndrome C2750426 Disease or Syndrome C84647 Cellosaurus