A parathyroid adenoma is a noncancerous (benign) tumor of the parathyroid glands. The parathyroid glands are located in the neck, near or attached to the back side of the thyroid gland.
The parathyroid glands in the neck help control calcium use and removal by the body. They do this by producing parathyroid hormone, or PTH. PTH helps control calcium, phosphorus, and vitamin D levels in the blood and is important for healthy bones.
Most parathyroid adenomas do not have an identified cause. Sometimes a genetic problem is the cause. This is more common if the diagnosis is made when you are young.
Conditions that stimulate the parathyroid glands to get bigger can also cause an adenoma. These include:
Women over age 60 have the highest risk for developing this condition. Radiation to the head or neck also increases risk.
Many people have no symptoms. The condition is often discovered when blood tests are done for another medical reason.
Parathyroid adenomas are the most common cause of hyperparathyroidism (overactive parathyroid glands), which leads to an increased blood calcium level. Symptoms may include any of the following:
Blood tests may be done to check levels of:
A 24-hour urine test may be done to check for increased calcium in the urine.
Other tests include:
Surgery is the most common treatment, and it often cures the condition. But, some people choose to only have regular checkups with their health care provider if the condition is mild.
To help improve the condition, your provider may ask you to stop taking calcium and vitamin D supplements. Women who have gone through menopause may want to discuss treatment with estrogen.
When treated, outlook is generally good.
Osteoporosis and the increased risk for bone fractures is the most common concern.
Other complications are less common, but may include:
Complications from surgery include:
Call your provider if you have symptoms of this condition.
Reviewed By: Brent Wisse, MD, board certified in Metabolism/Endocrinology, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.