Sialolipoma of the parotid gland: Case report with literature review comparing major and minor salivary gland sialolipomas
A 69-year-old White male presented to the otolaryngology clinic with a right parotid mass of approximately 5-year duration, without history of xerostomia, salivary pain, odynophagia, dysphagia, weight loss, mouth pain, facial weakness, hemoptysis, infection, or conditions associated with immunodeficiency. Significant medical history included Type II diabetes, prostatic cancer, hypercholesterolemia, hypertension, and back pain. On examination, a 2×2 cm soft mass was palpated over the right parotid bed, which was nontender and mobile. Computed tomography (CT) scan showed a 1.9×2.3 cm encapsulated hypodense, hypoenhancing mass in the anterosuperior aspect of the right parotid gland []. The density of the mass was consistent with fat with intralesional heterogeneity. Fine needle aspiration was performed twice, but was nondiagnostic. The patient was treated surgically with a right superficial parotidectomy with facial nerve preservation.\nOn gross pathologic examination, a 2.7×2.2×1.5 cm well-circumscribed pale, firm soft tissue mass abutting the anterior margin of the specimen was noted. On microscopy a well-delineated lesion was observed, composed predominantly (75-90%) of mature adipose tissue with interspersed aggregates of oncocytic cells in small acini and clusters. A diagnosis of sialolipoma was rendered [Figures –].