Not Everything Is as It Seems: A Case Series and Overview of Diseases Mimicking Antineutrophil Cytoplasmic Antibody-Associated Vasculitis.

Antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) is a rare heterogeneous disease in which treatment must be initiated early to prevent irreversible organ damage and death. There are several diseases that can mimic AAV, even in the presence of positive ANCA serology and/or histological evidence of vasculitis, as demonstrated in this case series. We reflect on the diagnostic approach of patients with AAV and provide an overview of AAV-mimicking diseases that can be considered in patients with atypical disease presentation or course.

[Chronic anemia and unexplained inflammation: think of VEXAS syndrome]. / Chronische anemie en onverklaarde ontsteking.

BACKGROUND: VEXAS-syndrome is an X-linked acquired multisystemic autoinflammatory disease caused by a somatic mutation in UBA1. CASE DESCRIPTION: In this manuscript we describe a 79-year-old male suffering from skin lesions, macrocytic anemia and lab results showing inflammation in which, based on finding a mutation in UBA1, VEXAS was diagnosed. He was treated with a combination of high dose corticosteroids and anti-IL-6 with good response. CONCLUSION: In middle aged males presenting with multisystemic inflammation without evidence of infection a diagnosis of VEXAS should be considered, especially if there is evidence of a macrocytic anemia. Early testing for UBA1 mutations helps in making the diagnosis. Despite treatment with intensive immunosuppression mortality remains high.