1. French Reference Center for Histiocytosis, APHP Trousseau Hospital, Sorbonne Université Paris France
2. Intensive Care Unit, APHP Trousseau Hospital, Sorbonne Université Paris France
3. Department of Pediatric Hematology Robert‐Debré Hospital Paris France
4. Department of Radiology, APHP Trousseau Hospital, Sorbonne Université Paris France
5. French Reference Center for Histiocytosis Saint Louis Hospital, Université de Paris France
6. Pediatric Pulmonology Department and Reference Center for Rare Lung Diseases, Inserm UMR_S933, Inserm UMR_S1158 Centre de Recherche Saint Antoine, APHP, Trousseau Hospital, Sorbonne Université Paris France
7. Pathology Department EA4340‐BECCOH, Assistance Publique–Hôpitaux de Paris (APHP), Ambroise‐Paré Hospital, Paris‐Saclay University, Versailles SQY University (UVSQ) Boulogne France
8. Service de Chirurgie Thoracique, Vasculaire et Transplantation Cardio‐pulmonaire Hôpital Marie‐Lannelongue Le Plessis‐Robinson France