Thyrotropin secreting tumors constitute 0,9 to 2,8% of all pituitary tumors. Thus, it is very rare tumor of this endocrine gland. Standards of the diagnosis of TSH-omas are based on me lack of inhibition of TSH levels in the presence of increased free thyroid hormones and abnormal, neoplastic intrasellar or parasellar mass. The additional criterion is lack of response of TSH after TRH stimulation. The proper treatment is surgical excision (selective adenomectomy) by the transsphenoidal route. In this paper we report the case presenting TSH-oma and consecutive subacute thyroiditis.