Midline Brain Abnormalities Across Psychotic and Mood Disorders

Area of Science:

• Neuroscience
• Psychiatry
• Neuroimaging

Background:

• Schizophrenia is associated with midline brain structure abnormalities.
• Cavum septum pellucidum (CSP) and absent adhesio interthalamica (AAI) are key midline abnormalities.
• Previous research has not extensively studied these abnormalities across multiple psychiatric diagnoses.

Purpose of the Study:

• To investigate the prevalence of CSP and AAI in a large, multidiagnostic patient sample.
• To compare the prevalence of these abnormalities between patients with various psychotic and mood disorders and healthy controls.

Main Methods:

• Assessed CSP and AAI in 639 patients with schizophrenia, delusional disorder, schizoaffective disorder, bipolar disorder, major depressive disorder, or first-episode psychosis/mania/depression.
• Compared findings with 223 healthy controls.
• Utilized logistic regression to calculate odds ratios (OR) for the presence of abnormalities.

Main Results:

• Patients with psychotic or mood disorders exhibited significantly increased prevalence of both CSP (OR=2.1) and AAI (OR=2.6).
• The combined presence of CSP and AAI was also significantly higher in patients (OR=3.8).
• These increased prevalences were observed across most studied disorders, even after controlling for confounding factors.

Conclusions:

• Midline brain abnormalities are generally more prevalent in patients with mood and psychotic disorders.
• The nonspecificity of these findings suggests a potential shared neurodevelopmental etiology underlying these diverse psychiatric conditions.
• Further research into neurodevelopmental factors is warranted to understand the shared pathophysiology.