Organ psychoses resemble diseases due to primarily organic causes. They are based on disturbances of the body ego acquired in childhood, becoming manifest after a prolonged latency, and they involve by preference the endocrine and gastrointestinal systems (thyrotoxicosis and anorexia nervosa are examples). Meng first introduced this concept in 1934, stating that every organic pathologic process has psychologic components. The distinction from organ neuroses lies in the role of the ego: organ psychosis is a primary disease of the ego; in organ neurosis the ego is affected only secondarily.