This is an observational study to monitor female participants exposed to UPLIZNA during pregnancy. This study requires voluntary reporting of pregnancies in female participants with NMOSD exposed to UPLIZNA during pregnancy or within 6 months preceding conception. Pregnancy-related data, potential confounding factors and information related to pregnancy outcome will be collected. The schedule of office visits and all treatment regimens will be determined by the treating healthcare provider. Duration of the study is 10 years, at minimum.