This study demonstrates a high prevalence of subclinical hyperthyroidism in patients presenting with non-toxic nodular goitres and suggests that the number of nodules, but not their total volume, is an important factor in the development of this condition.
In patients with hCG-secreting germ cell tumours complete suppression of plasma LH and FSH with increased plasma concentrations of both testosterone and oestradiol are often discovered. No such gonadotrophin suppression is found in patients with Leydig cell tumours, but the negative correlation observed between plasma testosterone and oestradiol in these patients suggests a weak negative feedback effect of oestradiol on LH secretion, which cannot be demonstrated by basal LH measurements in plasma.
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