MONDO_0024526 (Zimmermann-Laband syndrome 1) is any Zimmermann-Laband syndrome in which the cause of the disease is a mutation in the KCNH1 gene. Also known as: KCNH1 Zimmermann-Laband syndrome, Laband Syndrome, ZLS1, Zimmermann-Laband syndrome caused by mutation in KCNH1, fibromatosis, gingival, with abnormal fingers, fingernails, Nose, and ears, and splenomegaly.