| I just looked it up and this is about the best I could do with an answer.
Organic Personality Disorder is an old term no longer used in psychiatry. It dates back a number of years, and includes dementia, delirium, psychosis not related to schizophrenia or mood disorders, brain injured patients, patients with diseases that effect behavior, Parkinsonism, etc. Basically, it was what we called folks that acted in a manner consistent with damage to the brain, but not fitting into standard depression, schizophrenia, or anxiety disorders.
The implication was that the disorders like depression or schizophrenia were not organic, which they are. We have since defined patients with delirium, dementia, head injury, viral diseases of the brain, Parkinsonism, etc as their own diseases. All of these use to be Organic Personality Disorders.
It was a term used to lump together several disorders they now have separate diagnosis for.
A persistent personality disturbance that represents a change from the individual's previous characteristic personality pattern. (In children, the disturbance involves a marked deviation from normal development or a significant change in the child's usual behavior patterns lasting at least 1 year).
There is evidence from the history, physical examination, or laboratory findings that the disturbance is the direct physiological consequence of a general medical condition.
personality alteration due to frontal lobe damage; systemic lupus erythematosis; Huntington's Disease, and many other medical/neurological conditions. The DSM-IV goes on to define several subtypes, such as a "labile, disinhibited, aggressive, apathetic, paranoid", etc. | 
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