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Introduction: Dandy-Walker malformation is a rare congenital malformation involving cystic dilatation of the fourth ventricle, enlarged posterior fossa, complete or partial agenesis of the cerebellar vermis, elevated tentorium cerebelli, and hydrocephalus. Previous research highlighted a possible role for the cerebellum in schizophrenia as well as the contribution of underlying brain malformations to treatment resistance. Here, we present a case of a Dandy-Walker malformation-like condition revealed by a refractory schizophrenia in a 24-year-old male patient. We also conduct a literature review of all previously published case reports or case series of co-occurring posterior fossa abnormalities and schizophrenia or psychosis using a PubMed search query to better understand the potential link between these two disorders. Case Presentation: A 9-month hospital stay was needed to address the treatment-resistant psychotic symptoms, and the patient continued to experience moderate symptoms despite the prescription of various antipsychotic and antidepressant medications. After an irregular initial medical follow-up, the patient is currently treated with 350 mg daily clozapine and 20 mg daily prazepam and still exhibits moderate anxiety without delirious thoughts, however allowing him to re-enroll at the university. Regarding the literature, 24 cases published between 1996 and 2017 were identified, reviewed and compared to the present case report. Discussion: This case report and literature review further illuminates the pathophysiology of psychotic disorders including the potential role of the cerebellum, reinforces the importance of a multidisciplinary approach for the neurological and psychiatric management of patients with schizophrenia, and highlights optimal pharmacological management strategies for treatment-resistant schizophrenia.

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Our study revealed that SZ patients displayed a reduction of the leftward functional lateralization for language; however, no reduction of CC volume was observed, whereas BD patients presented a decreased volume of the CC associated with a lower leftward asymmetry for language. The results of our study detected distinct anomalies in both SZ and BD that may be considered as specific biomarkers of these disorders related to neurodevelopmental models.

Background Patients with schizophrenia (SZ) present a higher level of cardiovascular morbidity than the general population due to poor physical tness and a sedentary lifestyle. Moreover, despite major therapeutic advances in the management of SZ, some clinical symptoms remain resistant to pharmacological approaches. A large number of studies support the effectiveness of physical activity (PA) for both physical and mental health in SZ. The main objective of the present study is to assess the effects of a remote, web-based adapted PA program (e-APA) compared to a health education program (e-HE) on brain plasticity in SZ and healthy volunteers (HV). The secondary objectives are to assess the effects of e-APA on other cerebral variables as well as clinical, neurocognitive, circadian, biological, and physiological variables. Methods: The study is an interventional, multicenter, randomized open-label controlled trial. Forty-two SZ will be randomized to either the active group (e-APA, N = 21) or non-active group (e-HE, N = 21), and 42 HV will be matched to SZ according to age, gender, and level of PA. Interventions will consist of 32 sessions (2x60 minutes/week, for 16 weeks) via supervised home-based videoconferencing. The active group will carry out an individualized PA program of moderate to vigorous intensity. Pre-and post-intervention cerebral magnetic resonance imaging (MRI) will be performed to evaluate changes in global hippocampal volume. Other cerebral assessments using diffusion tensor imaging, arterial spin labelling, spectroscopy and resting-state functional MRI will be performed. In addition, clinical, neurocognitive and circadian rhythms assessments as well as physical tests and biological analyses will be conducted. Discussion: To our knowledge, this is the rst study aiming to evaluate the e cacy of APA delivered by supervised home-based videoconferencing in SZ. Moreover, using multimodal MRI, this study could clarify the pathophysiological mechanisms underlying the e cacy of APA. Finally, this innovative approach (remote, web-based APA) might also increase participation in long-term PA since PA-based programs are known to have low adherence and early dropout. The results of this study should promote the inclusion of PA interventions as a novel adjunctive therapy for SZ. Trial registration: ClinicalTrials.gov identi er: NCT03261817. Registered on

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Background Patients with schizophrenia (SZ) present a higher level of cardiovascular morbidity than the general population due to poor physical fitness and a sedentary lifestyle. Moreover, despite major therapeutic advances in the management of SZ, some clinical symptoms remain resistant to pharmacological approaches. A large number of studies support the effectiveness of physical activity (PA) for both physical and mental health in SZ. The main objective of the present study is to assess the effects of a remote, web-based adapted PA program (e-APA) compared to a health education program (e-HE) on brain plasticity in SZ and healthy volunteers (HV). The secondary objectives are to assess the effects of e-APA on other cerebral variables as well as clinical, neurocognitive, circadian, biological, and physiological variables. Methods: The study is an interventional, multicenter, randomized open-label controlled trial. Forty-two SZ will be randomized to either the active group (e-APA, N = 21) or non-active group (e-HE, N = 21), and 42 HV will be matched to SZ according to age, gender, and level of PA. Interventions will consist of 32 sessions (2x60 minutes/week, for 16 weeks) via supervised home-based videoconferencing. The active group will carry out an individualized PA program of moderate to vigorous intensity. Pre- and post-intervention cerebral magnetic resonance imaging (MRI) will be performed to evaluate changes in global hippocampal volume. Other cerebral assessments using diffusion tensor imaging, arterial spin labelling, spectroscopy and resting-state functional MRI will be performed. In addition, clinical, neurocognitive and circadian rhythms assessments as well as physical tests and biological analyses will be conducted. Discussion: To our knowledge, this is the first study aiming to evaluate the efficacy of APA delivered by supervised home-based videoconferencing in SZ. Moreover, using multimodal MRI, this study could clarify the pathophysiological mechanisms underlying the efficacy of APA. Finally, this innovative approach (remote, web-based APA) might also increase participation in long-term PA since PA-based programs are known to have low adherence and early dropout. The results of this study should promote the inclusion of PA interventions as a novel adjunctive therapy for SZ. Trial registration: ClinicalTrials.gov identifier: NCT03261817. Registered on 16 August 2017.