[Familial nonneoplastic inappropriate thyrotropin secretion].

A follicular thyroid carcinoma was suspected in a 62-year-old woman after the fifth goitre excision for non-neoplastic inappropriate thyrotropin secretion. Small-follicular adenoma could not be excluded histologically. After an attempt at thyrotropin suppression with L-thyroxine, triiodothyronine, D-thyroxine with L-thyroxine, and bromocriptine had failed, lasting if partial decrease in the maximally elevated TSH levels was achieved with triiodothyroacetic acid (TRIAC). One of the patient's three daughters also has non-neoplastic inappropriate thyrotropin secretion and has had two goitre excisions. It is most likely a familial form of inappropriate TSH secretion.