Parathyroid carcinoma and hungry bone syndrome

Area of Science:

• Endocrinology
• Oncology
• Surgical Pathology

Background:

• Parathyroid carcinoma is a rare endocrine malignancy.
• Patients often present with severe hypercalcemia, significant bone disease, and palpable neck masses.
• Surgical resection is the primary treatment modality.

Observation:

• Two patients with parathyroid carcinoma exhibited extremely high calcium and parathyroid hormone (PTH) levels, severe bone disease, and neck masses.
• Both patients underwent parathyroidectomy, with one developing lung metastasis.
• Significant hypocalcemia occurred post-surgery in both cases, necessitating intravenous calcium replacement.

Findings:

• The observed hypocalcemia was attributed to hungry bone syndrome (HBS), a state of rapid mineralization following correction of hyperparathyroidism.
• HBS was evident after initial parathyroidectomy in one patient and after metastasis removal in the other.
• The severity of pre-operative bone disease correlated with the likelihood of developing HBS post-operatively.

Implications:

• Hungry bone syndrome (HBS) post-parathyroidectomy in parathyroid carcinoma suggests successful removal of hypersecretory parathyroid tissue.
• HBS, while indicating a favorable surgical outcome, requires careful management with calcium supplementation.
• This case series highlights the importance of recognizing and managing HBS in patients with parathyroid carcinoma and severe bone disease.