Thyroid dyshormonogenesis is a rare condition due to genetic defects in the synthesis of thyroid hormones.
Patients develop hypothyroidism with a goiter. It is due to either deficiency of thyroid enzymes, inability to concentrate, or ineffective binding.
This is due to inability to produce thyroid hormones due to congenital absence of peroxidase or dehalogenase enzymes
One particular familial form is associated with sensorineural deafness (Pendred's syndrome).
OMIM includes the following:
|Type 2B||274600 (Pendred)||SLC26A4|
These patients respond well to levothyroxine (synthetic T4) and the goiter may decrease in size if any. They may not require surgery at any time.