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[A case of functioning parathyroid cyst].

K Tsujikawa1, Y Kobayashi, S Yamaguchi

  • 1Department of Urology, Ikeda Municipal Hospital.

Hinyokika Kiyo. Acta Urologica Japonica
|September 29, 1999
PubMed
Summary
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This study details a rare case of primary hyperparathyroidism caused by a functioning parathyroid cyst. Surgical removal normalized parathyroid hormone levels, highlighting this unusual cause of hypercalcemia.

Area of Science:

  • Endocrinology
  • Surgical Pathology
  • Medical Imaging

Background:

  • Primary hyperparathyroidism is a common endocrine disorder, often caused by adenomas or hyperplasia.
  • Recurrent kidney stones and hypercalcemia are key clinical indicators necessitating further investigation.
  • Functioning parathyroid cysts are exceedingly rare, posing diagnostic challenges.

Observation:

  • A 45-year-old male presented with hypercalcemia and a history of recurrent kidney stones.
  • Imaging studies revealed a cyst on the right thyroid lobe, associated with elevated intact parathyroid hormone (PTH) levels.
  • Histological examination confirmed cystic degeneration of a parathyroid adenoma.

Findings:

  • The parathyroid cyst was identified as the source of excess PTH secretion.

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  • Surgical excision (right superior parathyroidectomy) led to normalization of plasma intact PTH levels.
  • This case contributes to the limited reported instances of functioning parathyroid cysts, particularly in the Japanese literature (48 cases).

    • Implications:

    • Highlights the importance of considering rare causes of hyperparathyroidism, such as functioning parathyroid cysts.
    • Demonstrates the efficacy of surgical intervention for symptomatic parathyroid cysts.
    • Emphasizes the role of advanced imaging and histological analysis in diagnosing and managing these rare endocrine abnormalities.