Turner Syndrome (Monosomy X; Gonadal Dysgenesis) By Nina N Powell-Hamilton, MD, Sidney Kimmel Medical College at Thomas Jefferson University Reviewed / Revised Dec 2021 | Modified Sep 2022 View Patient Education Pathophysiology Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Turner Syndrome (Webbed Neck) Turner Syndrome Turner Syndrome (Upper Skeletal... In Turner syndrome, girls are born with one of their two X chromosomes partly or completely missing.