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Thymic parathyroid carcinoma and postoperative hungry bone syndrome
Manju Chandran1, Leonard J Deftos, Cynthia A Stuenkel
1Division of Endocrinology and Metabolism, UCSD School of Medicine, La Jolla, California, USA.
Summary
Parathyroid carcinoma can occur in ectopic tissue, presenting with vague symptoms. Post-surgery, patients may experience hypocalcemia even with normal calcium levels, highlighting the need for careful monitoring.
Area of Science:
- Endocrinology
- Oncology
- Surgical Pathology
Background:
- Parathyroid carcinoma is a rare endocrine malignancy.
- Ectopic parathyroid tissue can be found in various locations, including the thymus.
- Nonspecific symptoms can mask the diagnosis of parathyroid carcinoma.
Observation:
- A 33-year-old male presented with fatigue and depression, later found to have hypercalcemia, elevated parathyroid hormone, and alkaline phosphatase.
- Imaging revealed activity in the thymic region, leading to surgical exploration.
- Pathology confirmed parathyroid carcinoma originating from ectopic tissue in the thymic bed.
Findings:
- Surgical excision of the parathyroid carcinoma was performed.
- Postoperatively, the patient developed symptomatic hypocalcemia despite initially normal serum calcium levels, indicative of hungry bone syndrome.
- This case highlights the potential for parathyroid carcinoma in ectopic locations and the complex postoperative metabolic changes.
Implications:
- Clinicians must consider parathyroid carcinoma in patients with nonspecific symptoms and hypercalcemia, especially when ectopic tissue is suspected.
- Prompt and wide local excision is crucial for suspected parathyroid carcinoma.
- Awareness of potential rapid calcium shifts post-surgery is vital for managing hypocalcemia, even with seemingly normal calcium levels.