Pituitary Volume Alterations in Psychotic Disorders
Summary
The pituitary gland, a central node of the hypothalamic-pituitary-adrenal (HPA) axis, has emerged as a region of interest in the pathophysiology of psychotic disorders. Volumetric studies using structural magnetic resonance imaging have reported both enlargement and reduction of pituitary size in schizophrenia, schizoaffective disorder and bipolar disorder with psychotic features. These conflicting findings reflect differences in illness stage, antipsychotic exposure and stress regulation. Increased pituitary volume is thought to reflect HPA hyperactivity and heightened cortisol secretion, whereas reductions may follow prolonged therapeutic intervention or stress-modulating treatments. Associations have been observed between larger gland size and greater symptom severity, impaired cognitive function and higher antipsychotic dose. Conversely, interventions such as cognitive behavioural therapy for psychosis appear to normalise pituitary volume, suggesting plasticity in stress-related neuroendocrine circuits. Across diagnostic subgroups, pituitary alterations may serve as state markers of acute exacerbation rather than stable traits, yet longitudinal data remain sparse. Improved harmonisation of imaging protocols and larger multisite cohorts are now clarifying the utility of pituitary volumetry as a biomarker for illness monitoring, therapeutic response and risk stratification in individuals at high risk of psychosis.
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Pituitary Volume Alterations in Psychotic Disorders publication trend
The graph below shows the total number of articles in pituitary volume alterations in psychotic disorders across all publications each year (not limited to Nature Index journals).
Technical terms
Hypothalamic-pituitary-adrenal (HPA) axis: The hormonal system involving the hypothalamus, pituitary gland and adrenal glands that regulates stress responses.
Pituitary gland volume: The three-dimensional measurement of the anterior pituitary obtained through magnetic resonance imaging, used as an index of gland activity.
Psychotic disorders: A group of psychiatric conditions characterised by hallucinations, delusions and disordered thinking, including schizophrenia and schizoaffective disorder.
State marker: A biological or clinical feature that varies with illness activity or symptom severity rather than remaining constant over time.
References
- Enlarged pituitary gland volume: a possible state rather than trait marker of psychotic disorders. Psychological Medicine (2024).
- Pituitary volume reduction in schizophrenia following cognitive behavioural therapy. Schizophrenia Research (2017).
- Pituitary Volume and Socio-Cognitive Functions in Individuals at Risk of Psychosis and Patients With Schizophrenia. Frontiers in Psychiatry (2018).
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