Amygdala volume in schizophrenia: post-mortem study and review of magnetic resonance imaging findings

Area of Science:

• Neuroscience
• Psychiatry

Background:

• Schizophrenia is increasingly linked to the limbic system, supported by magnetic resonance imaging (MRI) studies indicating reduced hippocampus and amygdala volumes.
• However, some post-mortem studies have not corroborated these volumetric abnormalities.

Purpose of the Study:

• To investigate amygdala volume in post-mortem brains of individuals with schizophrenia.
• To address discrepancies between MRI and post-mortem findings regarding amygdala size in schizophrenia.

Main Methods:

• Amygdala volume was quantified using point-counting techniques on both hemispheres.
• The study included post-mortem brains from 10 male and 8 female patients diagnosed with schizophrenia.
• A comparison group comprised 9 males and 9 females without schizophrenia.

Main Results:

• No statistically significant reduction in amygdala volume was observed in patients with schizophrenia compared to the control group.
• These findings indicate that amygdala volume reduction is not a universal characteristic of schizophrenia.

Conclusions:

• The study concludes that significant amygdala volume reduction is not a consistent neuropathological finding in schizophrenia.
• Discrepancies with prior MRI meta-analyses may stem from methodological biases in early imaging studies, such as coarse delineation methods.