Sialolipoma of the Lower Lip: Case Report and Literature Review
A 54-year-old Caucasian female was seen by her general dentist for evaluation of a painless swelling in her lower lip. There was no history of trauma or infection and the patient’s medical history was unremarkable. An intra-oral examination revealed a 0.6x0.6cm soft tissue mass with normal overlying mucosa in her left lower lip, while an extra-oral examination revealed a normal facial morphology. The clinical differential diagnosis included mucocele, fibroma, lipoma, and salivary gland neoplasm. An excisional biopsy was performed and submitted to the Oral and Maxillofacial Pathology Department at University of Maryland, Baltimore. On gross examination, the mass was well-circumscribed, tan in color, soft in consistency and measured 0.6cm at its largest diameter. The histological examination revealed a mass of mature adipose tissue completely encapsulated by a fibrous band. Islands of salivary gland acini and ducts were located within the tumor. Neither atypia nor mitotic figures were observed in either the salivary glandular type tissue or the adipocytes. Mild lymphocytic infiltration and ductal dilation were seen (Fig. ). Consequently, the lesion was diagnosed as sialolipoma and no further treatment was required. The patient has been followed for 3 years without evidence of recurrence.