Abstract
A 26-year-old woman, pregnant for the 3rd time, was admitted in the 2nd trimester with bleeding and slight signs of thyreotoxicosis. The free thyroxin, total thyroxin and TRH-test confirmed the diagnosis. The patient was delivered 8 weeks before term of a living boy of 1680 g. Immediately after the child, a 300 g normal placenta was born, followed by 650 g of molar tissue.
Four weeks after birth and evacuation of the molar tissue, the patient was euthyreoid, with normal thyreoid parameters. It is presumed to have been a twin pregnancy, in which the part transformed to molar tissue has secreted a thyroid stimulating factor.