4hРThe indications for scintigraphic thyroid imagingРDetermination of functional status of thyroid nodules. ?Differentiation among the causes of thyrotoxicosis, that is, Graves disease from subacute, silent, postpartum, or factitious hyperthyroidism. ?Detection of ectopic tissue (lingual thyroid). ?Determination of a cervical or mediastinal mass is thyroid tissue. ?Determination of metastases in patients with thyroid carcinomas?Assistance in the evaluation of congenital hypothyroidism anification defects.РNormal imagingРIsthmus may demonstrate relatively decreased pared with the adjacent lobes.Рa pyramidal lobe is identified that arises from the isthmus or medial aspect of one lobe and extends superiorly and medially.Рa an with reasonably homogeneous distribution of activity in both lobes.
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