"Persistent thymus" has been a term in the literature, though a term about which much skepticism has gathered. But it is gradually becoming established as a fact that the thymic parenchyma persists throughout life, and that this parenchyma may become reactivated to the extent that its secretion influences the endocrine equilibrium. The causes of such a reactivation are not known. Studies of the histologic picture afforded by such a reactivation are rare ; hence the following data from a case that for want of a better term may be called thymic myasthenia.
REPORT OF CASE
—G. N., a farmer, first seen at the age of 19, had been suffering for two years from shortness of breath. He had measles as a child ; no other diseases except a headache about three to five times a year since 10 years of age. The patient vomited at the end of each attack. Formerly