{Reference Type}: Case Reports {Title}: Multisystem Inflammatory Syndrome: A Case in an Adult With Controlled Lymphoma and a Persistent SARS-CoV-2 Infection. {Author}: Pipitò L;Medaglia A;Russotto I;Bonura S;Cascio A; {Journal}: Cureus {Volume}: 15 {Issue}: 6 {Year}: 2023 Jun 暂无{DOI}: 10.7759/cureus.40776 {Abstract}: Multisystem inflammatory syndrome (MIS) is a new and rare complication of COVID-19 that usually occurs in children. An increasing number of cases of MIS in adults are described in the literature. The condition is associated with high mortality, and treatment is non-standardized. Clinical pictures are heterogeneous, and diagnosis is very challenging. Here we describe a case of MIS in a 60-year-old man with previous follicular lymphoma treated with obinutuzumab and recent SARS-CoV-2 infections. He complained of an unknown fever and developed pancytopenia during the hospitalization, associated with a general clinical worsening. The patient was successfully treated with intravenous immunoglobulin and steroids.