I am... Newly Diagnosed A Patient or Caregiver A Researcher A Healthcare Professional I am... Select a group Newly Diagnosed A Patient or Caregiver A Researcher A Healthcare Professional Learn & Helpful Tips Histio Educational Opportunities One of the primary goals of the Histiocytosis Association is to provide the Histio Community with information that can help you better understand histiocytic disorders, their diagnosis, treaments and possible long-term effects. Back to Histio U