Title : Rapidly progressive cognitive and sensory decline following covid-19: An illustrative case of the diagnostic evaluation of suspected demyelinating disease
Abstract:
Background: Multiple sclerosis (MS) is a chronic immune-mediated demyelinating disease of the central nervous system that commonly presents in young adults with multifocal neurologic deficits and characteristic magnetic resonance imaging (MRI) findings. However, early presentations may be diagnostically challenging, particularly when imaging findings are subtle or nonspecific and laboratory evaluation is unrevealing. A broad differential diagnosis—including post-viral inflammatory syndromes, autoimmune disorders, vascular abnormalities, infectious etiologies, and metabolic conditions—must be considered before establishing a diagnosis of demyelinating disease. This case illustrates the complexity of evaluating a patient with rapidly progressive neurologic symptoms following a recent COVID-19 infection.
Case Presentation: A 30-year-old woman developed progressive neurologic symptoms over several months following recovery from COVID-19. Her clinical course was characterized by worsening sensory loss, cognitive decline, visual disturbances, and increasing functional impairment that progressed on an almost daily basis. She underwent evaluation by multiple specialists, yet the underlying diagnosis remained uncertain despite extensive investigation. Brain MRI demonstrated scattered periventricular and juxtacortical white matter hyperintensities that were concerning for, but not diagnostic of, a demyelinating process. Comprehensive laboratory testing, including autoimmune, infectious, inflammatory, and metabolic studies, was unrevealing. The absence of a definitive diagnosis despite progressive neurologic decline prompted further investigation with cerebrospinal fluid (CSF) analysis and additional neuroimaging to better characterize the suspected inflammatory demyelinating process while excluding alternative etiologies. Consideration was also given to congenital vascular variants identified during the diagnostic workup that could potentially complicate radiographic interpretation.
Discussion: The diagnosis of early demyelinating disease frequently requires integration of clinical history, serial neurologic examinations, MRI findings, CSF studies, and exclusion of competing diagnoses. Although post-infectious immune activation has been proposed as a potential contributor to inflammatory neurologic disorders, establishing a causal relationship remains challenging, and temporal association alone should not be interpreted as causation. This case underscores the importance of maintaining a broad differential diagnosis while pursuing a systematic evaluation in patients with rapidly progressive neurologic symptoms.
Conclusion: Rapidly progressive neurologic decline in a young adult warrants prompt and comprehensive evaluation for inflammatory demyelinating disease even when initial laboratory studies are unrevealing. Early recognition, serial imaging, CSF analysis, and multidisciplinary collaboration are critical for establishing an accurate diagnosis and initiating timely management. This case highlights the diagnostic challenges encountered during the early stages of suspected demyelinating disease and reinforces the importance of a thorough, evidence-based approach to atypical neurologic presentations.
