Aggressive course of cognitive impairment in multiple sclerosis: A new term for the management of patients

Multiple sclerosis (MS) can create different kinds of symptoms by involving different fields of the central nervous system. Cognitive impairment (CI) is one of the symptoms that can be caused by the onset of the disease and provide a change in the patient's quality of life. Considering the course of the disease, CI usually worsens increasingly, and there is usually a severe CI in patients with end stage of MS. However, progressing CI can be so fast and severe in a few patients that it can disrupt the daily affairs of the individual. This paper plans to define the aggressive course of CIs in MS patients according to the reported cases. This definition explains that, the aggressive course of CI in MS patients happens in less than 5 years from the onset of the disease, and during this time, it causes dementia in the patient.