Hypodensity in right lobe of thyroid what is hypodensity.?

The prefix hypo- means that something is below or under the threshold of normalcy. So, hypodensity means that there is an area that appears more diffused when looked at in an x-ray. A hypodensity of the thyroid usually indicates the appearance of a nodule in the thyroid. A needle biopsy is usually performed to determine the status of the nodule.