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Neurosurgery for mental disorder (psychosurgery) matters because its history illustrates why permanent, irreversible brain procedures are now used only as an absolute last resort. Early leucotomy, also called lobotomy (a crude, permanently destructive cut through frontal brain tissue, pioneered by Egas Moniz), was performed widely in the mid-20th century and caused severe, permanent personality change and cognitive harm in many patients. For example, imagine a patient given a leucotomy for chronic agitation decades ago: many such patients were left apathetic, disinhibited, or profoundly changed in personality, harms that could never be undone. This history is exactly why any modern psychosurgery is rare, tightly regulated, and reserved for the most refractory (treatment-resistant) cases.

Modern psychosurgery is a stereotactic (precisely targeted using brain imaging) ablative procedure, destroying a tiny, carefully located area of brain tissue, such as cingulotomy or capsulotomy, unlike the crude, widespread destruction of historical leucotomy. It is offered only for severe, refractory (treatment-resistant) depression or obsessive-compulsive disorder (OCDObsessive-compulsive disorder, a condition of unwanted repeated thoughts and the actions done to relieve them.Read more →, an anxiety-related condition with intrusive thoughts and repetitive behaviours) that has failed every other treatment. Take a patient with decades of severe, unremitting OCD who has exhausted every standard and specialist option: modern ablative psychosurgery might be considered only after independent, multidisciplinary review. In practice, because the tissue destruction is permanent, the decision is irreversible, unlike deep brain stimulation (DBS), whose electrodes can be switched off or removed.

• Under the Mental Health Act in England and Wales, what is required before neurosurgery for mental disorder?
• Which procedure is among those still performed as neurosurgery for mental disorder?
• What is historically notable about the originator of prefrontal leucotomy?

• Deep brain stimulation (DBS), reversible, with electrodes that can be switched off or removed, unlike psychosurgery which destroys tissue permanently.
• Electroconvulsive therapy (ECT), causes no permanent structural brain damage, whereas psychosurgery permanently destroys a targeted area of tissue.
• Historical leucotomy (lobotomy), a crude, widely destructive procedure with severe harms, unlike modern stereotactic (precisely targeted) ablative psychosurgery, which destroys a far smaller area.
• Vagus nerve stimulation (VNS), a reversible implanted device stimulating a peripheral nerve, rather than a permanent, irreversible brain procedure like psychosurgery.

• Managerial approval does not substitute for the statutory safeguards.
• He was honoured rather than sanctioned in his lifetime.
• The treating clinician cannot authorise this alone, and the patient's own consent is essential.
• No court order is required under the Act for this treatment.
• The nearest relative cannot consent on the patient's behalf here.

• Identify the drug, receptor, enzyme or pharmacokinetic change named in the stem.
• Translate it into the immediate mechanism before looking at the options.
• Use timing and the adverse-effect pattern to separate the nearest alternatives.
• Check whether the question asks for mechanism, clinical consequence, monitoring or management.