The term “paranoia” is derived from a Greek words meaning “madness”, “beside”, and “mind”. The term was used to describe a mental illness in which a delusional belief is the sole or most prominent feature. Kraepelin used the term “pure paranoia” to describe a condition in which a delusions was present, but without any apparent deterioration in intellect and without any of the other features of ...

This review traces, through psychiatric textbooks, the history of the Kraepelinian concept of paranoia in the 20th century and then relates the common reported symptoms and signs to the diagnostic criteria for paranoia/delusional disorder in DSM-III through DSM-5. Clinical descriptions of paranoia appearing in 10 textbooks, published 1899 to 1970, revealed 11 prominent symptoms and signs report...

Although obsessive jealousy is a highly disturbing disorder, frequently it goes unrecognized, as most attention is paid to delusional jealousy, being the more prominent clinical phenomenon. In order to distinguish obsessive from delusional jealousy, the basic clinical characteristics of these two types of jealousy are presented, as well as the mechanism of their respective genesis, and the diff...

Induced delusional disorder or folie a deux in a 19 year old girl from India whose 16 years old younger sister had paranoid schizophrenia is described. Transient sharing of delusional beliefs by those living with the patients may be an extension of unsubstantiated beliefs held by the community.

BACKGROUND Utilization of diagnostic information from national patient registries rests on the quality of the registered diagnoses. We aimed to investigate the agreement and consistency of diagnoses of psychotic and bipolar disorders in the Norwegian Patient Registry (NPR) compared to structured interview-based diagnoses given as part of a clinical research project. METHODS Diagnostic data fr...

Ekbom Syndrome is characterized by delusion that small living being infests skin. The clinical profile of this disorder has shown it to be associated with organic conditions. Neuroimaging studies implicate putamen as the brain structure involved in the pathophysiology. These are also known as organic delusional disorder and provide an opportunity to study biological causation of delusional diso...