Alaska's Western Arctic Caribou herd forms aggregations or groups that can stretch for miles. The herd is on a three-year census schedule. The Department attempted a census during July 2002 but high wind, snow and fog forced a one-year delay. Weather almost prevented the 2003 attempt as well.
Finally, thyroid cancer may also be detected as a cause of an enlarged thyroid gland. It is quite clear that enlargement of the thyroid or the presence of nodules within the thyroid is common, particularly as revealed when sensitive imaging techniques such as ultrasound are used.
Both too much and too little thyroid hormone most often result from autoimmune disorders that cause the body's immune system to attack the thyroid and interfere with its function, Singer said. The most common cause of hypothyroidism is known as Hashimoto's disease, and the most common cause of hyperthyroidism is called Graves' disease.