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Parathyroid carcinoma is a rare entity accounting for only 0.5% to 5% of all cases of parathyroid neoplasm. Most of these mali-These tumors may also be nonfunctional, which is even rarer. Clinical detection of nonfunctioning parathyroid carcinoma prior to operation is primarily based on symptoms of an expanding neck mass and voice change. These condition may allow it to escape clinical attention until it has achieved an advanced state. So, the prognosis is relatively too bad. Most of these tumors often arise from preexisting parathyroid hyperplasia or adenoma. En bloc resection of primary lesion, ipsilateral thyroid lobe and this paper, we will introduce a case report of a bilateral nonfunctioning parathyroid carcinoma secondary to chronic renal failure. (Korean J Otolaryngol 2003 ;46 :532-5)