1. Five cases of parotid cancer are reported, in which the patients underwent parotidectomy under diagnosis of benign tumor in another hospital or department, were postoperatively diagnosed with malignant tumor, and then received reoperation in our department. 2. The age and sex distribution of the cases was 3 males and 2 females with a mean age of 40 years, ranging from 10 to 77 years, including 2 child cases under 15 years. 3. Histopathologically, the cancer was classified as adenoid cystic carcinoma in 2 cases, mucoepidermoidcarcinoma in 2 cases, and acinic cell carcinoma in 1 case, and one each of adenoid cystic carcinoma and mucoepidermoid carcinoma occurred in the children. 4. The patients underwent reoperation within 8 weeks after the first surgery. The surgical technique was total parotidectomy in 1 case and superficial lobectomy in the remaining 4 cases, with the facial nerve being preserved in all 5 patients. 5. Palpation in the examinations conducted at follow-up in our department detected no localized tumor remnant, but the tumor was still found to be histologically residual in 4 of the 5 cases. 6. The postoperative clinical course was found to be excellent, without recurrence or metastasis of the cancer.
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