NLRP3 and cryopyrin-associated periodic syndrome: Myeloid restricted, non-malignant somatic mosaicism with low and variable degree (8–27 %) has recently been reported in the NLRP3 gene of patients with the autoinflammatory, variant type Schnitzler syndrome, an urticarial and systemic inflammation disease with monoclonal gammopathy [26], and in a case of cyropyrin associated periodic syndrome (CAPS) [27].