"Knuckle sign", Turner's syndrome, and congenital hypothyroidism.
D002648:Child; D002675:Child, Preschool; D003409:Congenital Hypothyroidism; D005260:Female; D005384:Finger Joint / Q000002:abnormalities*; D006801:Humans; D008297:Male; D008662:Metacarpophalangeal Joint / Q000002:abnormalities*; D014424:Turner Syndrome / Q000150:complications*