Psychopathic disorder is 'a persistent disorder or disability of mind.which results in abnormally aggressive or seriously irresponsible conduct on the part of the person concerned'.

"Timothy has consistently exhibited profound mental and developmental retardation, deafness and blindness, a persistent convulsive disorder and severe cerebral palsy," they said.

In any year, according to the group, about five million Americans suffer from severe and persistent mental disorders, including schizophrenia, bipolar disorders and major depression.

In women, a similar condition of persistent arousal can be caused and is called persistent genital arousal disorder.

It also appears in ICD-10, under its Latin name Paranoia querulans, in section F22.8, "Other persistent delusional disorders".

Others had a more persistent disorder, some of whom had already been treated unsuccessfully.

- Court orders to close a property where there has been persistent disorder.

For example, Type Os who eliminate wheat often relieve many of their symptomatic behaviours, such as sneezing, respiratory problems, snoring or persistent digestive disorders.

We'll kick off this list of 10 unusual sexual conditions by looking at one of the latter, which might sound kind of fun at first: persistent genital arousal disorder (PGAD).

There is not enough known about persistent genital arousal disorder to definitively pinpoint a cause.