<prompt> False about isotope scanningRadiolabelled iodine 123I is usedMajority 80 of cold swellings are benign5 functioning or warm swellings will be malignantUseful in hypothyroid patients  <response>: Radiolabelled iodine 123I is used majority 80 of cold swellings are benign and some 5 functioning or warm swellings will be malignant. Principal value is in the toxic patient with a nodule or nodularity of the thyroid.Ref: Bailey and love 27e, page no: 804 