Multiple Sclerosis Followed by Neuromyelitis Optica Spectrum Disorder: From the National Multiple Sclerosis Society...

Area of Science:

• Neuroimmunology
• Neurology
• Clinical Case Study

Background:

• A patient presented with neurological symptoms at age 18, diagnosed with relapsing-remitting multiple sclerosis (MS).
• Over decades, the patient experienced disease progression and a severe myelitis episode at age 57.

Purpose of the Study:

• To analyze a complex neurological case involving a potential dual diagnosis of MS and neuromyelitis optica spectrum disorder (NMOSD).
• To emphasize the importance of reconsidering initial diagnoses in light of new clinical and paraclinical evidence.

Main Methods:

• Clinical case review including patient history, neurological examination, and disease course.
• Neuroimaging analysis (MRI) for characteristic lesions.
• Cerebrospinal fluid (CSF) analysis for oligoclonal bands and IgG index.
• Serological testing for aquaporin-4 (AQP4) antibodies using cell-based assays.

Main Results:

• Initial diagnosis of MS was supported by MRI findings (ovoid lesions, Dawson fingers) and CSF analysis.
• At age 57, the patient developed longitudinally extensive transverse myelitis and tested positive for AQP4 antibodies, suggestive of NMOSD.
• The patient's clinical course and diagnostic workup indicated the presence of two distinct central nervous system inflammatory disorders.

Conclusions:

• The patient likely had two co-existing CNS inflammatory conditions: MS and NMOSD.
• This case underscores the necessity for clinicians to reassess initial diagnoses when new evidence emerges.
• Reconsideration of diagnoses is crucial, especially when encountering conditions like NMOSD that may mimic or co-occur with MS.