Accounts of a schizophrenia-like syndrome are rare before the 19th century. Detailed case reports from 1797 and 1809, are regarded as the earliest cases of the disorder. Schizophrenia was first described as a distinct syndrome affecting teenagers and young adults by Bénédict Morel in 1853, termed "démence précoce" (literally 'early dementia'). The term dementia praecox was used in 1891 by Arnold Pick in a case report of a psychotic disorder. In 1893 Emil Kraepelin introduced a new distinction in the classification of mental disorders between "dementia praecox" and mood disorder (termed manic depression and including both unipolar and bipolar depression). Kraepelin believed that "dementia praecox" was primarily a disease of the brain, and a form of dementia, different from other forms of dementia such as Alzheimer's disease which usually happen later in life.