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  • Title: Keratocystoma of the parotid gland.
    Author: Komatsu H, Kumoi K, Inokuchi G, Hashimoto K, Nagao T, Otsuki N, Nibu KI.
    Journal: Auris Nasus Larynx; 2020 Jun; 47(3):481-484. PubMed ID: 31230813.
    Abstract:
    An 18-year-old man had a painless, elastic, firm mass in his left parotid area that gradually increased in size over a period of 6 months. At the time of examination, the parotid mass was poorly mobile and 46 mm in size. Although fine needle aspiration cytology revealed no malignant findings, we suspected a malignancy because the movement of his left mouth angle was slightly impaired; facial nerve paralysis as a result of tumor invasion was suspected. A superficial parotidectomy was performed. The tumor had a strong adhesion to the subcutaneous tissue and facial nerve. Histologically, multiple, randomly distributed cystic structures containing keratinized lamellae were present. The cystic spaces were lined with stratified squamous epithelium lacking a granular layer, and no skin appendage was observed. We diagnosed this case as a keratocystoma. Keratocystoma of the parotid gland is a rare benign tumor with only 6 cases reported worldwide. This case is the first to describe facial nerve palsy in association with a keratocystoma.
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