Parathyroid Adenoma: What It Means, How It Is Found and When It Needs Surgery

A parathyroid adenoma is a benign enlargement of one parathyroid gland. It is the most common cause of primary hyperparathyroidism, a condition that can lead to raised calcium levels in the blood.

Many patients first hear the term “parathyroid adenoma” after blood tests, an ultrasound scan or a nuclear medicine scan. Understandably, the word adenoma can sound worrying. In most cases, however, a parathyroid adenoma is not cancer. The issue is not usually that it is malignant, but that it is overactive.

Quick answer: what is a parathyroid adenoma?

A parathyroid adenoma is a non-cancerous overgrowth of one parathyroid gland. The gland produces too much parathyroid hormone, which can raise blood calcium and affect bones, kidneys and quality of life. When appropriate, the definitive treatment is surgical removal of the overactive gland.

How does a parathyroid adenoma affect calcium?

The parathyroid glands control blood calcium through parathyroid hormone. When one gland becomes autonomous, it may continue producing PTH even when calcium is already high. This can cause calcium to rise and may lead to symptoms or long-term complications.

Patients may have fatigue, low mood, brain fog, constipation, thirst, frequent urination, muscle aches, kidney stones or osteoporosis. Some patients have no obvious symptoms and are diagnosed only because blood tests show raised calcium.

How is a parathyroid adenoma diagnosed?

The diagnosis of primary hyperparathyroidism is made using blood tests, usually showing raised calcium with raised or inappropriately normal PTH. A scan may suggest the location of a parathyroid adenoma, but scans do not replace biochemical diagnosis.

This point is important. A patient can have primary hyperparathyroidism even if the scan does not clearly show an adenoma. Similarly, a scan finding must be interpreted in the context of calcium and PTH results.

Which scans can find a parathyroid adenoma?

Common localisation tests include neck ultrasound and sestamibi scanning. Ultrasound can assess the thyroid and may identify a parathyroid adenoma near the thyroid gland. Sestamibi is a nuclear medicine scan that can help identify overactive parathyroid tissue.

In more complex cases, such as negative scans, previous neck surgery, recurrent disease or suspected ectopic glands, CT or other specialist imaging may be recommended.

What if my scans are negative?

Negative scans can be frustrating, but they do not necessarily mean that surgery is impossible or that the diagnosis is wrong. Some adenomas are small, located in unusual positions, or difficult to distinguish from thyroid nodules or lymph nodes.

In scan-negative disease, the decision-making becomes more specialist. Some patients may need further imaging. Others may be suitable for four-gland exploration, where the surgeon examines all parathyroid glands to identify the abnormal gland or glands.

When does a parathyroid adenoma need surgery?

Surgery may be advised if there are symptoms, persistently high calcium, kidney stones, reduced kidney function, osteoporosis, fractures, younger age or other recognised criteria. Some patients choose surgery because symptoms are affecting quality of life, while others need treatment to protect bones and kidneys over time.

The operation is called parathyroidectomy. If a single adenoma is well localised, a focused operation may be possible. If there is concern about more than one gland, or if imaging is unclear, a four-gland exploration may be more appropriate.

What technology can improve precision?

Modern parathyroid surgery may include intraoperative PTH monitoring, which checks whether PTH falls appropriately after removal of the abnormal gland. A significant fall supports biochemical cure during the operation.

Parathyroid autofluorescence is another advanced technique that can help identify parathyroid tissue in real time. Nerve monitoring may also be used to support safety around the recurrent laryngeal nerve, which controls vocal cord movement.

Why choose Hampshire ENT Clinics?

Hampshire ENT Clinics provides specialist thyroid and parathyroid assessment across Hampshire. Mr Matthew Ward has extensive experience in focused parathyroidectomy, four-gland exploration, revision parathyroid surgery and parathyroid surgery alongside thyroid disease. Mr Hani Nasef also has specialist head and neck expertise including thyroid and parathyroid disease.

Patients can be assessed with review of blood tests, imaging and symptoms, with a clear explanation of whether surgery is appropriate and what type of operation is most suitable.

Frequently asked questions

Is a parathyroid adenoma cancer?

No, the vast majority of parathyroid adenomas are benign. The problem is that the gland is overactive, not usually that it is malignant.

Can a parathyroid adenoma go away by itself?

Usually no. A true overactive parathyroid adenoma generally does not disappear spontaneously, although calcium levels can fluctuate.

Can medication cure a parathyroid adenoma?

Medication may help manage calcium in selected patients, but surgery is usually the definitive treatment for suitable patients with primary hyperparathyroidism.

What scan is best for a parathyroid adenoma?

There is no single best scan for every patient. Ultrasound and sestamibi are commonly used first. CT or other imaging may be considered in complex or scan-negative cases.

Does a negative scan rule out parathyroid disease?

No. Primary hyperparathyroidism is diagnosed biochemically. Scans help localise disease for surgery but can sometimes be negative.

What is an ectopic parathyroid adenoma?

An ectopic adenoma is an overactive gland located away from the usual position. It may be lower in the neck or occasionally in the upper chest.

What is intraoperative PTH monitoring?

It is a blood test taken during surgery to check whether PTH levels fall after removal of the abnormal gland. It helps confirm cure during the operation.

What is parathyroid autofluorescence?

It is an imaging technology that helps the surgeon identify parathyroid tissue during the operation.

Will I need thyroid surgery too?

Not usually, but some patients have co-existing thyroid nodules or thyroid disease. If so, this is assessed and discussed before surgery.

Where can I be assessed?

Hampshire ENT Clinics offers consultant-led assessment for parathyroid adenoma and hyperparathyroidism, with surgery at Medicana Winchester when appropriate.