<prompt> which of the following statements is true regarding retro sternal goitres ?sternal incision is always requiredMajority of the goitres derive their bloodMajority of the retro sternal goitre can be removed by a neck incisionOperated only if patient is symptomatic  <response>: majority of the restrosternal goitres as are secondary goitres which can be removed a neck cervical incision ref : bailey and love 27th ed 