Abstract
A rare case of carcinoembryonic antigen (CEA)-producing branchiogenic carcinoma is reported. A 56-year-old man was referred to our clinic, because of a painless swelling in the right side of the neck. A branchial cyst was diagnosed from the clinical and radiological findings. The serum CEA level at presentation was above the normal range. The cyst was removed surgically. Histological findings showed a well differentiated squamous cell carcinoma arising from the branchiogenic cyst wall. Radiotherapy and chemotherapy were given, followed by surgical treatment. A squamous cell carcinoma was recognized in the right platoglossal arch 10 months after the cystectomy. The tumor was resected surgically, and supurahyoid neck dissection was performed bilaterally. The patient has been well without recurrence for 6 years since the second operation. The serum CEA level fluctuated parallel to development of the tumors. Immunohistochemical findings showed that the branchial tumor cells exhibited CEA in the cytoplasm.
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