Question:
What are rare causes of PHPT?
Author: H KAnswer:
Neonatal severe PHPT (homozygous inactivation of Ca sensors, fatal if not treated immediately w/total parathyroidectomy) Parathyroid cancer (<1%, difficult to dx preop no definitive cytology, severe hypercalcemia need hospitalization and marked elevation of PTH, rarely palpable neck, 5-year survival 86%)
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