A Case of Ioslated TSH Deficiency / 대한내분비학회지

Although complete or partial deficiency of anterior pituitary hormone is well known,but isolated TSH deficiency is relatively rare throughout the world. Hypothyroidism due to isolated TSH deficiency is diagnosed by 1)symptoms or signs of thyroid deficiency, 2)demonstration of an absent or impaired TSH response to TRH stimulation, 3)intact other pituitary hormones. We report a case of hypothyroidism due to isolated TSH deficiency. The patient was 75 years old man and his complaints were generalized edema and weight gain. On laboratory study, T3, T4, TSH was low and TSH response to TRH stimulation was blunted, but other piutuitary hormones were intact. After thyroxine replacement, TFT and his symptoms were recovered.