Quantitative Assessment of Peripheral Nerve Echogenicity in Children and Adolescents Aged 2–17 Years: A Retrospective Cross-Sectional Ultrasound Study

: We propose reference grayscale ranges for peripheral nerves in healthy children and adolescents as a practical benchmark for clinical use and future studies. Due to technical constraints-particularly retrospective image processing and non-lossless data export-each laboratory should establish its own reference dataset, or multicentric parameters should be established. As our sample consisted predominantly of Caucasian participants, ethnic differences should be considered when applying these values to other populations.