The case history of a young female patient is described, in whom a typical subacute thyroiditis of De Quervain was complicated by the occurrence of bilateral thrombosis of the subclavian and axillary veins. This unusual coincidence seemed to be suggestive of an association of these features with previous treatment, as 8 yr earlier she had been treated with mantle field irradiation and polychemotherapy for Hodgkin's disease. She recovered fully and at the time of the events described no relapse of Hodgkin's disease could be established.