“…We owe to Bonhoeffer (1917) the fundamental notion according to which the phenomenology of these psychoses is, for the most part, independent from the kind of somatic illness which caused it and consequently is not characteristic of the somatic illness itself. As these psychoses have some thing in common regarding their symptomatology and course, they have been summarized by Bonhoeffer (1917) as the 'acute exogenous syndrome' or as 'a type of acute exogenous reaction'. According to Bleuler (1955), the latter includes not only acute psychoses combined with general somatic illnesses, but also the ones due to an acute encephalopathy (traumatic, toxic, infectious, tumoral, degenerative, vascular) because both the first and the second psychoses present analogous psychopathological features.…”