Enlarged choroid plexus related to atrophy of hippocampal subfield volumes and glymphatic dysfunction in benzodiazepine use disorder

Abstract Aims The aim of this study was to explore the relationship of choroid plexus (CP) volume with hippocampal subregion volume and glymphatic system in patients with benzodiazepine use disorders (BUD). Methods Eighty‐four participants were recruited including 23 patients with BUD, 29 patients with chronic insomnia (CI) and 32 healthy controls (HC). The morphological alterations in CP, hippocampal subfield volumes and diffusion tensor image analysis along the perivascular space (DTI‐ALPS) index were compared between the three groups and the relationships between CP volume and hippocampal subfield volumes and the glymphatic system were further investigated. Results Compared with the HC individuals, the CP volumes augmented and hippocampal subfield volumes reduced in patients with BUD ( P < .05) but not in patients with CI ( P > .05). In patients with BUD, there were extensive relationships between augmented CP volume and decreased hippocampal subfield volumes ( P < .05, r = −0.421–−0.513). CP volume was negatively related with the DTI‐ALPS index ( r = −0.582, P = .004) within the BUD group. In patients with BUD, the volume of bilateral cornu ammonis (CA)1 body, molecular layer (ML) body, hippocampal tail, left CA1 head volumes, right dentate gyrus body volumes, and right CA4 body volumes were positively related with the Montreal Cognitive Assessment scores ( P < .05, r = 0.422–0.683). Right CA1 and ML body volumes positively related with the Mini‐Mental State Examination scores ( P < .05, r = 0.503–0.575). Conclusions The enlarged CP related to atrophy of hippocampal subfield volumes and the glymphatic system dysfunction were shown in BUD patients.