While the diagnosis of<unk>  is absent from recent revisions of the DSM and the ICD, many studies have recognized the condition as "a viable diagnostic entity that is distinct from schizophrenia, with organic factors playing a role in a significant portion of patients." As such,<unk>  is seen as being distinct from both schizophrenia and progressive dementia in old age. Ravindran (1999) developed a list of criteria for the diagnosis of<unk> , which agrees with much of the research done up to the time it was published. : 1. A delusional disorder of at least six months duration characterized by the following: :: a. Preoccupation with one or more semisystematized delusions, often accompanied by auditory hallucinations. :: b. Affect notably well-preserved and appropriate. Ability to maintain rapport with others. :: c. None of ::: i. Intellectual deterioration ::: ii. Visual hallucinations ::: iii. Incoherence ::: iv. Flat or grossly inappropriate affect ::: v. Grossly disorganized behavior at times other than during the acute episode. :: d. Disturbance of behavior understandable in relation to the content of the delusions and hallucinations. :: e. Only partly meets criterion A for schizophrenia. No significant organic brain disorder.
Paraphrenia
Oneirophrenia
Hapalonychia
Amastia
Dolichonychia
Steatopygia
White piedra
Platonychia