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Arquivos brasileiros de endocrinologia e metabologia 2004-Jun

[Primary hypothyroidism mimicking pituitary macroadenoma].

Aðeins skráðir notendur geta þýtt greinar
Skráðu þig / skráðu þig
Krækjan er vistuð á klemmuspjaldið
Carolina C R Betônico
Ricardo Rodrigues
Suzan C L Mendonça
Paulo Tannus Jorge

Lykilorð

Útdráttur

A 21-year-old woman complaining of 8-month amenorrhea associated to weight gain, galactorrhea and frequent headaches, presented for clinical evaluation; her laboratory tests were: TSH: 1192 mUI/ml (0.27-4.2); TT4: 1.0 microg/dl (4.4-11.4 l); TT3: 0.41 ng/ml (0.7-2.1); prolactin: 69.2 ng/ml (3-20) and a diagnosis of myxedema associated to galactorrhea was made. A hypothalamic-pituitary magnetic resonance imaging (MRI) showed a suprasellar and intrasellar mass lesion of 1.9 x 1.4 x 1.9 cm, determining compression and deviation of the optic chiasm. Due to the possibility of hyperplasia of the TSH-producing cells, treatment of hypothyroidism was initiated with levothyroxine. Two months later, upon normalization of thyroid hormones and TSH levels, a second MRI showed an anatomically normal pituitary gland. Regression of the pituitary mass after treatment with levothyroxine confirmed the hypothesis of pituitary hyperplasia secondary to primary hypothyroidism. Our findings support the importance of determining thyroid function tests during the investigation of pituitary masses and thus avoiding an unnecessary surgery.

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