| A rare primary congenital hypothyroidism with characteristics of a markedly reduced T4/T3 ratio, normal levels of thyroid-stimulating hormone and a highly variable clinical phenotype, which most commonly includes decreased metabolic rate, bradycardia, chronic constipation, neurodevelopmental delay, delayed bone age and skeletal abnormalities. Dysmorphic craniofacial features, such as macrocephaly, broad face, flat nose, large tongue and thick lips have also been reported. Some patients may show only minimal signs and symptoms. |
