[On rigidity of the bladder neck in infancy and childhood].
D034841:Abdominal Cavity; D006801:Humans; D008297:Male; D009127:Muscle Rigidity; D014521:Urethra / Q000002:abnormalities*; D001743:Urinary Bladder / Q000002:abnormalities*
BLADDER/abnormalities; URETHRA/abnormalities