RECURRENT HEMITHYROIDITIS - A CASE-REPORT

We report on a girl with recurrent painful thyroiditis which involved the entire right thyroid lobe, but did not spread to the left thyroid lobe. She occasionally developed pain and swelling of the right side o f the neck following symptoms of common cold over several years. Durin g these attacks, the right thyroid lobe was enlarged, tender, and very soft, while the left thyroid lobe was not remarkable. Ultrasonic exam ination revealed that the entire right thyroid lobe was hypoechoic, bu t the entire left lobe was normal echoic. Serum C-reactive protein, wh ite blood cell count, and erythrocyte sedimentation rate were increase d during the attacks. The thyroiditis responded quickly to treatment w ith prednisolone and/or anti-inflammatory drugs, but the thyroiditis m ay have subsided spontaneously since the signs and symptoms of thyroid itis had subsided with only antibiotic therapy. After resolution of th e thyroiditis, the echogenicity of the right lobe returned to near nor mal and the inflammatory findings became negative. During the investig ation, thyroid function was normal except for when the thyroiditis was first diagnosed at another hospital with a serum TSH level of 0.1 mU/ l. Serum thyroglobulin level was increased but returned to normal or d ecreased during and after attacks of thyroiditis. The mechanism(s) of the recurrent hemithyroiditis remains unknown, but the underlying dise ase appeared to be chronic thyroiditis since tests for anti-microsomal or anti-thyroid peroxidase antibodies were consistently positive duri ng the course of her illness. The changes in the titers of these antib odies were not clear during and after the attacks of thyroiditis. In a ddition, the clinical course suggests that the present hemithyroditis can be induced by recurrent upper respiratory infection.