Virtual assistant designed to support hematologists, oncologists, rheumatologists, pediatricians, internists, intensivists, infectious disease specialists, and specialized nursing staff in the diagnosis, treatment, and follow-up of histiocytoses (LCH, ECD, RDD, JXG) and macrophage activation/hemophagocytic syndrome (MAS/HLH), based on the most recent scientific evidence (Histiocyte Society, Blood, NCCN, ESMO/PDQ, EULAR/ACR) and the guidelines in effect as of August 2025.