TMEM70 and pontocerebellar hypoplasia type 1: (2) Methods: This retrospective study, conducted between January 2019 and January 2025 at the Clinical Genetics and Metabolics Outpatient Clinic in Košice, included 61 patients aged from infancy to 25 years diagnosed with hypomyelinating leukodystrophy 14, pontocerebellar hypoplasia type 1B, neuronal ceroid lipofuscinosis 7, or TMEM70 deficiency.