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Background and Objectives:In hemithyroidectomy, most surgeons don’t care about postoperative hypothyroidism because ofthe remaining functioning contralateral thyroid lobe, but the incidence of hypothyroidism after hemithyroidectomy is reported from5 to 35%. The purpose of this study was to assess the incidence, natural history, factors contributing to hypothyroidism after hemithyroidectomy.Subjects and Method:212 consecutive cases of hemithyroidectomized patients diagnosed from Feb. 2001 throughDec. 2004 were retrospectively analyzed. One hundred thirty-six of 212 cases were enrolled in this study after the exclusion criteriaapplied. The definition of postoperative hypothyroidism was based on serum TSH and free T4 level. The relationship betweenhypothyroidism and several factors, such as mean age, sex, preoperative free T4, TSH, microsomal antibody, thyroglobulin antibodylevels and lymphocytic infiltration of the resected gland, were stastically analyzed. Results:The fifty eight of 136 patients(42.6%) became biochemical hypothyroidism postoperatively. Among them, 11 patients (8.1%) showed overt hypothyroidismand 47 patients (34.5%) showed subclinical hypothyroidism. In postoperative hypothyroid group, preoperative TSH, microsomaland thyroglobulin Ab levels and lymphocytic infiltration were significantly higher than in postoperative euthyroid group (p<0.05).The odds ratio of preoperative microsomal Ab, thyroglobulin Ab level and lymphocytic infiltration of resected gland was 17.18,3.01 and 2.26 folds, respectively. Conclusion:In this study, we confirmed that there was unexpectedly high incidence of postoperativehypothyroidism after hemithyroidectomy. We propose that preoperative high TSH level, positive microsomal Ab, thyroglobulinAb and marked lymphocytic infiltration of resected gland could be predicitive factors of postoperative hypothyroidismafter hemithyroidectomy. (Korean J Otolaryngol 2006;49:532-7)

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