Pediatric-onset multiple sclerosis (POMS) is a rare but significant neurological condition that poses a considerable threat to children’s health. Compared to adult-onset multiple sclerosis (AOMS), POMS is characterized by distinct clinical and pathophysiological features. Quality of life (QoL) is a crucial indicator of overall well-being in children with MS; however, its relationship with objective neurobiological markers — such as brain volumetric parameters — remains insufficiently explored in the pediatric population. This study aimed to examine the correlations between brain volumetric indices and QoL scores, as assessed by the PedsQL 4.0 questionnaire, in a cohort of children diagnosed with MS

The study included 39 pediatric MS patients. Spearman’s rank correlation coefficient (R) was used to analyze the associations between subjective QoL assessments and objective MRI‑derived brain volumetric data. Significant correlations were observed between self-reported QoL scores and the volumes of key brain structures. Notably, a strong positive correlation was found with thalamic volume (up to R = 0.55). In contrast, proxy-reported QoL scores provided by parents showed no significant correlations with any of the examined volumetric parameters. These findings highlight the potential role of thalamic volumetry as a morphometric biomarker of disease progression that aligns with the patient’s subjective experience of their condition. Despite the discrepancy between child and parent reports, we emphasize the importance of integrating both perspectives to ensure a comprehensive assessment of the patient’s status in clinical practice and future research.