Background: The purpose was to evaluate the thyroid function after subtotal thyroidectomy.
Methods: One hundred and nineteen patients operated on for multinodular benign goiter were included in this prospective study. Results of the surgical treatment were evaluated 6 months after operation by thyroid-stimulating hormone (TSH) assay and cervical echography.
Results: Thyroid-stimulating hormone levels correlated inversely (r=-0.78) with the thyroid remnant volumes. Forty-seven patients presented with a hypoechoic aspect of the remnant. Isoechoic and hypoechoic remnant volumes were similar; however, 46 of the 47 patients with a hypoechoic remnant (97.9%) had TSH levels higher than 5 mU/l vs. 39 of the 72 patients (54.2%) with an isoechoic aspect. No predictive factor for the occurrence of this hypoechoic feature was found.
Conclusions: After sub-total thyroidectomy for benign multinodular goiter, the volume of the remnant is not the only determinant of the occurrence of postoperative hypothyroidism. The appearance of a hypoechoic aspect of the remnant is also a strong predictive factor for such an outcome. In this case the occurrence of hypothyroidism is quite constant whatever the volume of the thyroid remnant. Since this evolution toward a hypoechoic aspect of the remnant is unpredictable, our results are an additional argument in favor of total thyroidectomy for benign multinodular goiter.
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