Computed tomography—scan of soft tissues of neck, including larynx, pharynx, upper oesophagus and salivary glands (not associated with cervical spine)—with intravenous contrast medium and with any scans of soft tissues of neck, including larynx, pharynx, upper oesophagus and salivary glands (not associated with cervical spine) before intravenous contrast injection, when undertaken, not being a service associated with a service to which item 56807 applies (R) (Anaes.)