What is the difference between Multisystem Inflammatory Syndrome in Adults (MIS-A) and MAS/HLH?

Macrophage activation syndrome (MAS)/hemophagocytic lymphohistiocytosis (HLH) are cytokine storm syndromes (CSS) associated with various infections, rheumatic conditions, and hematologic malignancies (among other etiologies). Multi-system inflammatory syndrome in adults (MIS-A) is a discrete entity ...