Natural history of parathyroid carcinoma. Diagnosis, treatment, and results.

From 1948 to 1983, 28 patients with parathyroid carcinoma underwent treatment and analysis at the Massachusetts General Hospital. This represents about 2 percent of the 1,200 patients with hyperparathyroidism managed during the period. Patient ages ranged from 18 to 72 years (mean 45 years) with equal numbers of both sexes (14 women and 14 men). There are several hallmarks that are clues to an increased index of suspicion preoperatively. Nine of the patients (32 percent) presented with palpable neck masses. Eleven patients (39 percent) had a serum calcium level greater than 14 mg/100 ml. Significant elevations of the parathyroid hormone level were noted with values two to three times normal. The incidence and severity of metabolic complications were prominent. These complications included renal stones in 18 patients (64 percent), bone disease in 14 patients (50 percent), peptic ulcer disease in 5 patients (18 percent), parathyroid crisis in 4 patients (14 percent), and pancreatitis in 2 patients (7 percent). Eleven of the patients underwent previous surgical therapy at other institutions, and 17 patients had their initial operation at our institution. Cervical parathyroid carcinomas that ranged from 1.5 to 27 g and 1.5 to 6 cm were excised. The characteristic appearance was a gray-white, stone hard parathyroid mass with invasion of adjacent tissue. The outcome was favorable for 16 surviving patients, with 14 (50 percent) showing no evidence of recurrence 2 to 17 years postoperatively and 2 alive with persistent disease 3 years after operation. Twelve patients died. Of these, eight had unsuccessful initial operative intervention with capsular rupture and dissemination of cancer, one had advanced disease with mediastinal extension which was unresectable, and three died from unrelated causes. Recurrences became apparent within 6 months to 3 years after operation and unfortunately denoted incurable disease. The mean survival time after operation in patients with recurrent disease was 7.6 years, ranging from 1 to 22 years. Carcinoma of the parathyroid gland is a rare entity. Although it is difficult to diagnose preoperatively, there should be an increased index of suspicion in those hyperparathyroid patients with palpable neck masses, profound hypercalcemia (greater than 14 mg/100 ml), marked increase in the parathyroid hormone level to greater than twice normal, and significant metabolic complications. The initial operation must be aggressive yet meticulous with en bloc resection of the parathyroid tumor and all adjacent invaded tissues, avoiding capsular violation or tumor spillage.(ABSTRACT TRUNCATED AT 400 WORDS)