While performing a systematic ultrasound study of the thyroid gland volume
for the evaluation of iodine deficiency in 2845 normal Belgian school child
ren, we found an absence of the left lobe in 6 children (4 girls and 2 boys
). There was no association with other thyroid malformations or dysfunction
.
Conclusion This first systematic ultrasound evaluation of thyroid hemiagene
sis in normal children established a prevalence of thyroid hemiagenesis of
0.2% and confirmed the female predominance and higher incidence of agenesis
of the left lobe.