Longitudinally Extensive Transverse Myelitis in Highly Active Relapsing-remitting Multiple Sclerosis.

Area of Science:

• Neuroimmunology
• Neurology
• Demyelinating Diseases

Background:

• Multiple sclerosis (MS) typically presents with short spinal cord lesions.
• Longitudinally extensive transverse myelitis (LETM) is an uncommon manifestation of MS.
• LETM is more frequently observed in patients with highly active disease or frequent relapses.

Observation:

• A patient with highly active relapsing-remitting MS, treated with interferon beta-1a, experienced LETM.
• The development of LETM occurred subsequent to multiple disease relapses.

Findings:

• This case highlights LETM as a rare phenotype in active MS.
• The patient's presentation underscores the variability of MS lesion patterns.

Implications:

• Accurate diagnosis of LETM in MS is critical for guiding treatment strategies.
• Distinguishing LETM in MS from other demyelinating conditions is essential for effective patient care.
• This case may inform future research into the pathogenesis and management of LETM in MS.