Since parathyroid carcinoma is a rare cause of hyperparathyroidism, few clinicians have had experience in managing such cases. Physicians and surgeons managing parathyroid disease must have a high index of suspicion to diagnose parathyroid carcinoma. Diagnosis can be difficult histologically, but clinical features with biochemical studies and microscopic study can help. The purpose of this study is to present the experience of King Faisal Specialist Hospital and Research Centre (KFSH&RC) in Saudi Arabia. Case Reports Case 1A 51-year-old Saudi male from the Western Province was diagnosed with hyperparathyroidism at his local hospital. He had a history of general weakness, lethargy, general bone aches and multiple joints pain. He had left lower parathyroidectomy and left hemithyroidectomy at the same hospital, and had an uneventful postoperative course. However, he continued to have hyperparathyroidism with hypercalcemia, with his parathyroid hormone (PTH) at 1064 ng/L (10-65), calcium (Ca++) at 3.88 mmol/L (2.10-2.55), alkaline phosphatase at 181 U/L (40-115), phosphate (PO 4 ) at 0.66 mmol/L (0.70-1.45), but with normal albumin. The patient also had renal function impairment, with creatinine at 169 μmol/L (60-115). He was referred to KFSH&RC for further management.The patient was treated intravenously with normal saline and diuretics. Sestamibi scan showed uptake in the left neck at the site of the left thyroid and also uptake laterally (Figure 1). The patient had exploration of his neck, where a recurrent tumor at the site of previous surgery, measuring about 2.5x2x1.5 cm in maximum diameters, was resected.Left neck dissection demonstrated a metastatic left internal jugular lymph node measuring about 2x1.5x1.5 cm in maximum diameters. Both tumors were easy to dissect from the surrounding tissues. There was no gross residual tumor left. We used meticulous dissection to avoid capsule rupture that could have led to tumor cell seeding. After the operation, the patient regained normal calcium levels. Six months later, the patient had normal calcium and normal parathyroid hormone, and his renal function had improved. Ultrasound scan of his kidneys demonstrated bilateral normal size without any evidence of stones. Sestamibi scan showed no uptake at the previous site of the parathyroid carcinoma. Case 2A 67-year-old Saudi female from Riyadh noticed a voice change of two months' duration. Examination confirmed right vocal paralysis. Preoperatively, she had high calcium of 2.62 mg/dL (normal 2.2-2.55). CT scan showed a 2-cm mass in the paratracheal area of the right neck. Exploration of the right neck demonstrated large inferior parathyroid glands (2.5 cm in diameter) adherent to the adjacent structures, including recurrent laryngeal nerve, trachea and the esophagus. We performed excision of the tumor and right hemithyroidectomy. Postoperatively, the patient regained normal calcium and PTH levels. Six months later, the patient's calcium and PTH levels were still normal. Pathological FindingsOne of the specimens measured ...
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