A 50-year-old female is referred for treatment of a serum calcium of 11.5 mg/dL one year after resection of a right superior parathyroid adenoma. The right and left inferior glands were normal at the initial neck exploration. The left superior gland was not visualized. Which of the related statements below are true?
A.	Recurrent postoperative hypercalcemia occurs in approximately 20% of patients with this clinical scenario
B.	Localization studies via selective angiography are successful in 50% to 80% of these patients
C.	The risk of permanent hypoparathyroidism is approximately 10% to 20% following reexploration in this setting
D.	Surgical reexploration by an experienced endocrine surgeon has a success rate of less than 50% in this circumstance
Answer:B
A 50-year-old female is referred for treatment of a serum calcium of 11.5 mg/dL one year after resection of a right superior parathyroid adenoma. The right and left inferior glands were normal at the initial neck exploration. The left superior gland was not visualized. Which of the related statements below are true?
A.	Recurrent postoperative hypercalcemia occurs in approximately 20% of patients with this clinical scenario B.	Localization studies via selective angiography are successful in 50% to 80% of these patients C.	The risk of permanent hypoparathyroidism is approximately 10% to 20% following reexploration in this setting D.	Surgical reexploration by an experienced endocrine surgeon has a success rate of less than 50% in this circumstance