Neuromyelitis optica spectrum disorder (NMOSD) is an inflammatory, demyelinating disease of the central nervous system that is characterized by severe attacks of optic neuritis and myelitis [
1]. Because 80–90% of patients with NMOSD experience relapsing episodes of optic neuritis and myelitis, early diagnosis and maintenance immunosuppressive therapy are important for preventing relapse. Although longitudinally extensive transverse myelitis (LETM), which is defined as myelitis extending over ≥ 3 vertebrae in magnetic resonance imaging (MRI) scans, is an NMOSD-specific radiologic finding, patients with NMOSD may also present with short transverse myelitis (STM). However, very short myelitis occupying less than half of a segment is extremely rare in NMOSD. …