Sixty-seven patients with sternomastoid tumours have been treated by stretching and manipulation of the neck and the results evaluated after an average follow-up of six and a half years. Stretching was found to be useful in early management, although initial facial asymmetry and limitation of neck rotation of over 30 degrees usually precluded a good prognosis. The results were also unsatisfactory if, during the first six months of treatment, improvement was slow; in such cases facial asymmetry and head-tilting frequently persisted.