Neuromyelitis optica spectrum disorder (NMOSD) is an autoimmune, demyelinating, inflammatory disease of the central nervous system, distinct from multiple sclerosis. NMOSD include optic nerve involvement as recurrent optic neuritis, and of the spinal cord as acute myelitis.
The relationship between vaccination and demyelination has not been fully described, furthermore, few reports are related to vaccines and NMOSD, this being rare, and its mechanism is poorly understood. However, it is generally attributed to an autoimmune overreaction of the body against the vaccine antigen. Previous case reports have emphasized that the most common demyelinating disease is acute demyelinating encephalitis, and it is most seen in children. (7).
A recent review of the literature from the past decade revealed that the most commonly reported vaccine-associated demyelinating diseases were diagnosed with ADEM and NMOSD, at 44% and 9%, respectively (8).
The most common reported side effects of COVID-19 vaccines have been localized pain at the injection site, low-grade fever, fatigue, myalgia, chills, and joint pain, and, rarely, anaphylactic shock (9).
The reported case is the first case in Peru of NMOSD that developed after the second dose of the attenuated COVID-19 vaccine. Some cases of NMOSD have already been reported worldwide, one case developing NMOSD after 2 months of the application of the attenuated virus vaccine against COVID-19 (10) and another case only after 10 days (11). Our patient developed NMOSD after 1 month. Regarding the type of vaccine, it has not only been reported with attenuated viruses but also with other types of vaccines (11, 12).
We were struck by the clinical presentation of acute brainstem syndrome, with pruritus being the first symptom, a presentation that has been previously described in NMOSD (13), and the following week, transverse myelitis was added, which delayed early diagnosis on admission. hospitable. The experience in Peru of cases of multiple sclerosis with initial symptoms of the brainstem could have been the reason for initially suspecting this pathology (14), however, the evolution and type of spinal cord lesions observed in magnetic resonance imaging after 2 weeks of the initial MRi clarified the diagnostic doubt.
NMOSD with positive AQP4 antibodies represents 80% of cases. Seronegative NMOSDs include other pathogenic antibodies against myelin oligodendrocyte glycoprotein (MOG). MOG is responsible for the stability of the myelin structure and has been postulated to be critical in relation to immune system interactions with the immune system, such as complement activation.
Although our case was negative for these 2 antibodies, the patient met the diagnostic criteria and it was decided to start treatment, as recommended in seronegative cases (15).
De novo cases following vaccination against different diseases appear more frequently IgG-AQP4 negative, while 75% relapsers are IgG-AQP4 antibody seropositive, and are primarily white women (16, 17).
NMOSD can coexist with other autoimmune disorders, such as Sjögren's syndrome (18), but we did not find any marker of associated autoimmune disease.
Likewise, our patient presented with venous thrombosis of the left lower limb, NMOSD is known to be a risk factor for venous thromboembolism (19). Additionally, she presented an alteration of the pulmonary tomography without clinical translation, an interstitial pulmonary lesion has been described since the Aquaporins4 are found in large quantities at the pulmonary level (20).
Further studies may be needed to clarify the possible connection between vaccination against COVID-19 and the development of NMOSD. However, both at the individual and population levels, the benefits of the COVID-19 vaccine far outweigh the risks of a neurological complication, although it would be important to consider the benefit-risk balance in patients with a diagnosis of NMOSD before vaccination.