A rare functional disorder with recurrent episodes of torticollis posturing of the head (inclination or tilting of the head to one side) in healthy children. The prevalence is unknown and the benign nature of the disorder probably means that it is under reported. Onset occurs within the first year of life with episodes occurring between every few weeks and every few months. The duration of the torticollis varies between patients, but usually lasts from a few hours to a few days. The frequency and duration of the torticollis episodes decrease as the patient gets older and episodes usually stop completely by 5 years of age. The disorder usually occurs sporadically, but familial occurrence has been reported. [from
SNOMEDCT_US]