If you're on dialysis and your parathyroid hormone levels won't stay down after surgery, the problem might not be your parathyroid gland at all. It could be a tiny piece of parathyroid tissue hiding somewhere unexpected, like your jaw.
A new case series describes three patients on maintenance dialysis who had recurrent secondary hyperparathyroidism, meaning their parathyroid hormone levels kept rising even after they'd already had surgery to remove parathyroid glands. When doctors used a specific imaging scan called 99mTc-MIBI SPECT/CT, they found ectopic parathyroid glands, tissue that had settled in the submandibular area, near the jaw. All three patients had another surgery to remove these masses. Afterward, their parathyroid hormone levels returned to normal, and their symptoms improved markedly.
The follow-up ranged from 3 to 37 months after the initial parathyroidectomy. The study highlights how important this imaging technique can be for finding these misplaced glands in cases of recurrent disease.
But there's a big caveat: this is a case series with only three patients. That's a very small sample size, and it means we can't draw firm conclusions about how well this approach works for everyone. The findings are low certainty. Still, for the three people involved, the outcome was a return to normal hormone levels and better symptoms.
Common questions
What is secondary hyperparathyroidism?
It's a condition where your parathyroid glands make too much parathyroid hormone (PTH). This often happens in people with kidney failure on dialysis. The extra PTH can cause bone problems and other issues. In this study, patients had recurrent secondary hyperparathyroidism, meaning their PTH levels went up again after initial treatment.
How common are ectopic submandibular parathyroid glands?
The study notes they are rare. Ectopic means the gland is in an unusual spot, like the submandibular area near the jaw, instead of its normal place. This case series found them in three dialysis patients with recurrent high PTH. Because it's so rare, doctors may not think to look there first.
What imaging test helps find these hidden glands?
The study highlights 99mTc-MIBI SPECT/CT. This scan combines two types of imaging to locate parathyroid tissue. In these three cases, it identified the ectopic glands in the submandibular region. That helped surgeons remove them. The authors say this imaging is important for finding such glands when PTH levels rise again.
Did surgery fix the problem for these patients?
Yes, for all three patients. After surgery to remove the submandibular masses, their PTH levels returned to the normal range. Their clinical symptoms also improved markedly. Follow-up ranged from 3 to 37 months after the first parathyroidectomy. However, this is a very small study, so results may not apply to everyone.
What are the limitations of this study?
The main limitation is the tiny sample size: only three cases. That makes the evidence low certainty. We can't say how often this approach works or who might benefit most. The study also doesn't report safety data like side effects. Talk to your doctor about your own situation.
