Abstract
Thyroid hemiagenesis (TH) is a very rare congenital anomaly of the thyroid gland with absence of a lobe. It is usually diagnosed incidentally, because does not cause clinical symptoms. The etiology of TH is not clear. The accurate prevalence of TH is not known because the patiens are usually asymptomatic. Several studies showed that the prevalence of the TH in normal population is 0.05-0.2%. The diagnosis of TH can be easily made by ultrasound (US) in most patients. In this report we present two patients who diagnosed by US with left thyroid lobe agenesis.
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