, also called neurosurgery for mental disorder (NMD), is the neurosurgical treatment of mental disorder.[1] Psychosurgery has always been a controversial medical field.[1] The modern history of psychosurgery begins in the 1880s under the Swiss psychiatrist Gottlieb Burckhardt.[2][3] The first significant foray into psychosurgery in the twentieth century was conducted by the Portuguese neurologist Egas Moniz. During the mid-1930s he developed the operation known as leucotomy. The practice was enthusiastically taken up in America by the neuropsychiatrist Walter Freeman and the neurosurgeon James W. Watts who devised what became the standard prefrontal procedure and named their operative technique lobotomy.[4] After World War II, Freeman broke with Watts and introduced a modification of the procedure which he termed transorbital lobotomy. This simplified procedure where an ice-pick or similar instrument entered the brain through the eye socket dispensed with the need for a neurosurgeon and became subject to widespread use in America.[1] In spite of the award of the Nobel prize to Moniz in 1949 the lobotomy was largely discredited and replaced by chlorpromazine in the 1950s. Other forms of psychosurgery, although used on a much smaller scale, survived. Some countries have abandoned psychosurgery altogether; in others, for example the US and the UK, it is regulated and only used in a few centres on small numbers of people with depression or obsessive-compulsive disorder (OCD) who have already undergone years of treatment.[5] In some other countries it is used in the treatment of schizophrenia and addiction.[6]

Psychosurgery is a collaboration between psychiatrists and neurosurgeons. During the operation, which is carried out under a general anaesthetic and using stereotactic methods, a small piece of brain is destroyed or removed. The most common types of psychosurgery in current or recent use are capsulotomy, cingulotomy, subcaudate tractotomy and limbic leucotomy. Lesions are made by radiation, thermo-coagulation, freezing or cutting.[1] About a third of patients show significant improvement in their symptoms after operation.[1] Advances in surgical technique have greatly reduced the incidence of death and serious damage from psychosurgery; the remaining risks include seizures, incontinence, decreased drive and initiative, weight gain, and cognitive and affective problems.[1]

Currently, interest in the neurosurgical treatment of mental illness is shifting from ablative psychosurgery (where the aim is to destroy brain tissue) to deep brain stimulation (DBS) where the aim is to stimulate areas of the brain with implanted electrodes.[7]

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