H syndrome, also known as Histiocytosis-lymphadenopathy plus syndrome or PHID,[1] is a rare genetic condition caused by mutations in the SLC29A3 gene which encode the human equilibrative nucleoside transporter (hENT3) protein.[2] It is also known as Faisalabad histocytosis, familial Rosai-Dorfman disease, sinus histocytosis with massive lymphadenopathy and pigmented hypertrichosis with insulin-dependent diabetes mellitus syndrome.

H‐like syndrome successfully treated with methotrexate
Anissa Zaouak MD  Hager Jaouadi MD  Amal Chamli MD  Raja Jouini MD  Sonia Abdelhak MD  Houda Hammami MD  Samy Fenniche MD
First published: 14 June 2019 https://doi.org/10.1111/dth.12994