# Primary Hyperparathyroidism From Concurrent Parathyroid Hyperplasia and Ectopic Parathyroid Adenoma: A Case Report

## TL;DR

A 72-year-old woman with persistent parathyroid issues had two rare conditions resolved only after surgery revealed hidden parathyroid problems.

## Contribution

This case report highlights the coexistence of parathyroid hyperplasia and an ectopic adenoma in PHPT, challenging diagnostic assumptions.

## Key findings

- Negative imaging failed to detect concurrent parathyroid hyperplasia and an ectopic adenoma.
- Resection of an ectopic paraesophageal adenoma resolved persistent PHPT after initial surgery.
- The case underscores that negative imaging does not rule out active parathyroid disease.

## Abstract

Primary hyperparathyroidism (PHPT), whether caused by an adenoma or hyperplasia, can be curative with parathyroidectomy. However, persistently elevated parathyroid hormone (PTH) despite parathyroidectomy suggests multigland disease. We present a case of concurrent single‐gland parathyroid hyperplasia and an ectopic parathyroid adenoma in a 72‐year‐old woman with long‐standing PHPT. Despite persistently elevated calcium and PTH levels, all diagnostic imaging was negative for parathyroid hyperplasia and adenoma. PTH remained elevated despite initial parathyroidectomy for hypercellular tissue consistent with hyperplasia. An ectopic paraesophageal parathyroid adenoma was ultimately discovered and resected, resolving the PHPT. This case emphasizes that negative imaging does not exclude active parathyroid disease.