The effect of subclinical hypothyroidism on ovarian volume in prepubertal girls.

Objective: Enlargement and cystic changes in ovaries of patients with long-standing overt hypothyroidism have been described in numerous case reports. However, there are limited data about the effect of subclinical hypothyroidism (SH) on ovarian volume. The aim of the study is to evaluate the relationship between serum thyroid stimulating hormone (TSH) level and ovarian volume in prepubertal girls with SH.

Methods: Patients who were aged between 6 and 10 years and diagnosed with SH and age-matched healthy euthyroid controls were enrolled in the study. All subjects were prepubertal.

Results: Thirty-five children with SH (mean age; 7.6±1.0 years) and 50 euthyroid healthy girls (mean age; 7.7±1.2 years) were enrolled in the study. TSH and LH levels and both ovarian volumes were significantly higher in SH group than controls (p<0.05). In addition, TSH was positively correlated with ovarian volumes and LH in patients with SH (p<0.05).

Conclusion: The results of this study showed that ovarian volumes of prepubertal girls with SH were significantly greater than those with normal thyroid function. Although ovarian enlargement and cyst formation is well recognized in long-standing overt hypothyroidism, it has been shown for the 1^st time in patients with SH.