Abstract
Posterior fossa arachnoid cysts (PFACs) are rare congenital abnormalities observed in 0.3 to 1.7% of the population and are traditionally thought to be benign. While conducting a neuroimaging study investigating cerebellar structure in bipolar disorder, we observed a higher incidence of PFACs in bipolar patients (5 of 75; 6.6%) compared to the neuronormative control group (1 of 54; 1.8%). In this report, we detail the cases of the five patients with bipolar disorder who presented with PFACs. Additionally, we compare neuropsychiatric measures and cerebellar volumes of these patients to neuronormative controls and bipolar controls (those with bipolar disorder without neuroanatomical abnormalities). Our findings suggest that patients with bipolar disorder who also present with PFACs may have a milder symptom constellation relative to patients with bipolar disorder and no neuroanatomical abnormalities. Furthermore, our observations align with prior literature suggesting an association between PFACs and psychiatric symptoms that warrants further study. While acknowledging sample size limitations, our primary aim in the present work is to highlight a connection between PFACs and BD-associated symptoms and encourage further study of cerebellar abnormalities in psychiatry.
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Acknowledgements
We would like to thank Fatimah Albazron, Jennifer G. Richards, Leela Sathyaputri, and Laren Garrett for their work on participant recruitment and their excellent technical assistance. This research was supported in part through computational resources provided by The University of Iowa, Iowa City, Iowa, and the team at ITS—Research Services.
Funding
This work was supported by the following grants: NIH grant R01MH111578, S10OD025025 (MRI instrument fund), and The University of Iowa Bipolar Disorder Research program of Excellence funded by the Roy J. Carver Charitable Trust.
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VAME: research project—organization, execution; data analysis—execution, review and critique; manuscript—manuscript—writing manuscript drafts, review and critique; JRP: research project—organization, execution; data analysis—execution, review and critique; manuscript—writing manuscript drafts, review and critique; JEB: data analysis—execution, review and critique; EJB: data analysis—execution, review and critique; manuscript—review and critique; ASA: research project—conception, execution; KGM: data analysis—design, execution, review and critique; JAW: research project—conception, organization, execution; data analysis—review and critique; manuscript—review and critique; VAM: research project—organization; data analysis—design, execution, review and critique; manuscript—review and critique; ADB: research project—conception; data analysis—design, execution, review and critique; manuscript—review and critique; KLP: research project—conception, organization, execution; data analysis—design, review and critique; manuscript—review and critique; JGF: research project—conception, organization, execution; data analysis—design, review and critique; manuscript—writing manuscript drafts, review and critique.
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All participants provided written informed consent in accordance with the University of Iowa Human Subjects Review Board policies. All procedures performed in the present work were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its amendments or comparable ethical standards.
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12311_2022_1408_MOESM1_ESM.png
Supplementary file1 Supplemental Fig. 1 Magnetic resonance images (MRI) of study participants who presented with posterior fossa arachnoid cysts, axial, and coronal views. a-e MRI images for bipolar patients, Mr. A, Mr. B, Mr. C, Ms. D and Ms. E, respectively. f MRI images for control participant, Mr. F. Cysts outlines in blue. (PNG 133 KB)
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Ewald, V.A.M., Purnell, J.R., Bruss, J.E. et al. Posterior Fossa Sub-Arachnoid Cysts Observed in Patients with Bipolar Disorder: a Retrospective Cohort Study. Cerebellum 22, 370–378 (2023). https://doi.org/10.1007/s12311-022-01408-1
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DOI: https://doi.org/10.1007/s12311-022-01408-1