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.
Hyperparathyroidism - parathyroid adenoma; Overactive parathyroid gland - parathyroid adenoma; Osteoporosis - parathyroid adenoma; Bone thinning - parathyroid adenoma; Osteopenia - parathyroid adenoma; High calcium level - parathyroid adenoma; Chronic kidney disease - parathyroid adenoma; Kidney failure - parathyroid adenoma
The parathyroid glands in the neck help control calcium absorption, 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 bone. It is important for healthy bones.
Parathyroid adenomas are common. 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.
Parathyroid adenomas may occur in people without a family history of the disease, or as part of 3 inherited syndromes:
In people with an inherited syndrome, a changed (mutated) gene is passed down through the family. You only need to get the gene from one parent to develop the condition.
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 the 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 or other medicines to prevent bone loss.
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.
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Silverberg SJ, Bilezikian JP. Primary hyperparathyroidism. In: Jameson JL, De Groot LJ, de Kretser DM, et al, eds. Endocrinology: Adult and Pediatric. 7th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 63.
Thakker RV. The parathyroid glands, hypercalcemia, and hypocalcemia. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 232.
Reviewed By: Sandeep K. Dhaliwal, MD, board-certified in Diabetes, Endocrinology, and Metabolism, Springfield, VA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.