Patient Wang, male, 65 years old, was admitted to the hospital on August 25, 2010, mainly because of a painless swelling in front of the left ear for 4 months. On May 26, 2010, the patient visited a local hospital, where ultrasound examination showed multiple hypoechoic nodules in the left parotid gland, the largest of which was 3.6×1.9 cm, with blood flow signal inside. The treatment was ineffective. About half a month later, the swelling became larger, and a follow-up examination at a local hospital showed that multiple hypoechoic nodules were detected in the left parotid gland, the largest of which was 4.6×2.4cm with blood flow signal. The ultrasound examination showed a hypoechoic nodule in the left parotid gland, 5.1×2.8 cm, with a regular shape and disorganized internal echogenicity. Today, she came to our hospital for follow-up examination and was admitted as “mucinous epidermoid carcinoma of the left parotid gland?” The patient was admitted to the hospital. Since the onset of the disease, the patient has been able to sleep and eat well, and her bowel movements are normal. Atrial fibrillation was detected in 2003 and was under treatment with medication. Physical examination showed good general condition, normal development, good nutrition, and cooperation with examination. Specialized conditions showed normal skin color in the left parotid area, a bulging mass of about 6×5×3 cm, smooth surface, hard texture, unclear border, no obvious activity, no tenderness and pressure pain. No enlarged lymph nodes were detected in the left submandibular and mandibular angle areas. Preliminary diagnosis: mucinous epidermis-like carcinoma of the left parotid gland? Post-admission examination and treatment: Routine examination was performed after admission, and no obvious contraindications to surgery were found. On August 27, a left parotid mass resection + facial nerve dissection was performed under general anesthesia, and frozen section was performed during the operation. The skin, subcutaneous tissues and broad neck muscle were incised, and the surface flap of the parotid gland in front of the ear was dissected and lifted to reveal the superficial lobe of the parotid gland. The superficial lobe of the parotid gland was dissected and the mass was found to have unclear borders and liquefied areas. About half an hour later, the frozen section was reported as malignant lymphoma. It was decided to completely remove the parotid gland and dissect the facial nerve at the same time, leaving the residual tumor cells on the facial nerve for later radiotherapy treatment. The mass was found to be wrapped around the facial nerve branch and the outer membrane of the nerve was found to be “blister-like” and edematous. The zygomatic branch of the facial nerve, the buccal branch and the mandibular margin branch were dissected in turn, and the superficial lobe of the parotid gland and the mass were completely removed. The deep lobe of the parotid gland was then excised. The wound was rinsed and closed in layers with interrupted sutures. One rubber drainage strip was placed and bandaged with pressure. Postoperative management: postoperative facial nerve dysfunction was detected, the rubber drainage strip was removed from the wound on the second day, and the wound was bandaged with pressure. The postoperative immunohistochemical pathology reported no mucosa-associated lymphoma. Systemic examination and regional lymph node examination were performed, and no regional lymph node enlargement or metastases from other sites were found. Local radiation therapy was then performed.