uptake가 줄었거나 dysgenesis가 있거나, 이소성이거나 해야할 것 같은데 스캔이 정상인 이유를 모르겠네요..

●Infants suspected of having transient hypothyroidism (eg, due to iodine deficiency or exposure, maternal autoimmune thyroid disease, or antithyroid drugs during pregnancy). The presence of a normal thyroid gland on ultrasonography or scan supports a diagnosis of mild, possibly transient, hypothyroidism. Cases of excess iodine exposure likely will have reduced radionuclide uptake until the excess iodine is cleared. Cases of transient hypothyroidism due to transplacental passage of maternal TSH-receptor blocking antibodies typically do not have radionuclide uptake or image on scanning, but on ultrasonography, a normal thyroid gland may be visualized.

업투데이트 내용인데, transient한 케이스일수도있지않을까요?