Cognitive impairment (CI) and fatigue have been recognized as an important feature of MS, affecting up to 70% patients (1), evident since onset and increase in both prevalence and severity as the disease progresses (2). In fact, their effects on patients and even their caregivers are more pronounced than clinical disability, causing unemployment, treatment non-adherence, personality changes as well as several psychosocial dysfunctions (3-5). Therefore, beside evaluating the physical disability, it is essential for health professionals to objectively evaluate either the cognitive function or fatigue at both baseline and during routine follow up visits for early detection and management (6). Through the advances in MRI techniques and availability of a number of automated software, quantitative radiological assessments became more readily available and feasible in daily practice (7) allowing objective longitudinal monitoring of patients (8,9). Although burden and location of lesions in RRMS is thought to be associated with cognitive impairment (CI), fatigue and physical disability, some controversy results were obtained from previous studies. So, by conducting this study, we aimed at exploring the relationship between different parameters of lesion load and location with fatigue, cognitive and physical disability in RRMS patients.
