Effect of Type-A Botulinum Toxin in the Post-radiosurgical Neck Contractures

Inclusion Criteria: * Patients from 18 to 75 years old; * malignant Tumor of aerodigestive ways, in forgiveness; * Treatment containing the external radiotherapy ended since \> 6 months * Life expectancy \> 6 months; * patient complaining from cervical spasms with functional disability; * Negative Pregnancy test; * Women under effective contraception; * Patients benefiting from a national insurance scheme; * Patient having given a written consent. Exclusion Criteria: * Cervico-facial Surgery with reconstruction by pedicled flap * Implantable Chamber with catheter in the internal jugular vein near the spasm; * Muscular, neurological Pathology or malformative pulling a disorder of perception of the pain, an amyotrophy, a muscular weakness affecting the cervical axis or the upper limbs; * Disorder generalized by the muscular activity (ex myasthenia); * Cervical osseous or muscular Pathology pulling pains and disability before the beginning of the treatment (cervical degenerative osteoarthritis diagnosed to the cervical radiography, the slipped disc); * Previous cervical injection of botulinum toxin ; * Local Infection at the level of one of the sites proposed for injection; * Histories of epilepsy; * Patients presenting a hypersensitivity to the botulinum neurotoxin A or in one of its excipients; * Patients under anticoagulation therapy, Under antibiotic treatment by aminoglycosides or amino 4 quinoline, under myorelaxant treatment or that must undergo an intervention with curarisation; * Patients for whom a surgical operation is planned in the zone interested in the treatment * Pregnant or breast-feeding Women; * Patients for whom questionnaires will not be assessable (handicaps of communication, patient not speaking French, etc.).