Images of the month: Intractable vomiting and neuromyelitis optica spectrum disorder.

Neuromyelitis optica spectrum disorder (NMOSD) is a rare inflammatory disorder of the nervous system which can be potentially debilitating. Its prevalence is estimated to be around 0.5-10 per 100,000 population with predilection towards Asians and females. It can be diagnosed based on core clinical characteristics, serum aquaporin antibodies and neuroimaging features. It is important to pick up the diagnosis of NMOSD as the treatment is different from other demyelinating disease. Here, we illustrate a case of NMOSD presented with intractable vomiting. © Royal College of Physicians 2020. All rights reserved.