Other causes Pitutary/hypothalami hypothyroidism Rare, measurement of Tsh levels fail to revel patient with pitutary-hypothalamic hypothyroidism, since they have low TSHOther Causes • Pitutary/hypothalamis hypothyroidism Rare，<5％, measurement of TSH levels fail to revel patient with pitutary-hypothalamic hypothyroidism, since they have low TSH