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An absence of half of the thyroid gland that is usually asymptomatic but may result in primary congenital hypothyroidism, a permanent thyroid deficiency that is present from birth. In symptomatic cases, clinical features and signs may include decreased activity and increased sleep, feeding difficulty, constipation and prolonged jaundice. Slow linear growth and developmental delay may also occur. Some familial cases have been reported suggesting genetic factors but to date none have been identified in humans.
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