What are the different kinds of myasthenia disorders?

From birth to later: Transient neonatal autoimmune myasthenia gravis, occurs when mother has mg, but lasts about 3 wks and then gone. Congenital myasthenia involves baby persistently. Ocular myasthenia affects only eye muscles, but 50% do develop full blown myasthenia gravis. In older age groups, there are 4 groups of severity, and pts can be classified by benign or malignant thymomas or even whether musk ab present.