[Specific features of multisystem inflammatory syndrome in adults related to SARS-CoV-2]

Multisystem inflammatory syndrome in adults (MIS-A) is a rare and severe entity occurring after SARS-CoV-2 infection, and it is often underrecognized in adults. The purpose of this study is to describe the clinical, paraclinical, therapeutic, and prognostic characteristics of MIS-A through a structured review of the literature. A search was conducted in PubMed, Scopus, and Web of Science databases up to May 2024. Articles included were clinical case reports or case series of MIS-A in adults. Eighteen (18) articles were included. MIS-A mainly manifests as persistent fever, multiorgan involvement, marked inflammatory response, and frequently negative SARS-CoV-2 PCR but positive serology. Treatment is based on immunoglobulins, corticosteroids, and, in some cases, anti-IL-6 therapy. Although rare, MIS-A represents a medical emergency to be considered in the aftermath of COVID-19 infection, even in asymptomatic cases. Diagnosis is based on nonspecific clinical and biological criteria, which makes recognition challenging. Early immunomodulatory treatment can improve prognosis.