Basal Cell Adenoma of the Upper Labial Mucosa: Report of a Rare Case

Basal cell adenoma (BCA) is a benign epithelial neoplasm of the salivary glands that most commonly arises in the parotid gland.Its occurrence in minor salivary glands, particularly in the upper lip, is uncommon and may pose a diagnostic challenge.We report the case of a 60-year-old woman who presented with a painless, gradually enlarging swelling of the upper labial mucosa.Clinical examination revealed a well-defined, bluish-purple lesion that did not blanch on diascopy.Ultrasonography demonstrated a heterogeneously hypoechoic lesion measuring 11 × 8 mm, with minimal internal vascularity.The lesion was surgically excised and submitted for histopathological examination, which revealed a proliferation of benign glandular epithelium arranged predominantly in tubular and papillary patterns, with fibrovascular cores within the papillary structures.The lumina of the tubular structures contained extracellular eosinophilic material.Based on the reported histopathological findings, a diagnosis of BCA with predominantly tubular architecture was rendered.Immunohistochemical evaluation was not performed.No recurrence was observed during one year of follow-up.This case highlights the uncommon occurrence of BCA in the upper labial mucosa and emphasizes the importance of histopathological assessment in differentiating minor salivary gland neoplasms from other lesions presenting as upper-lip swellings.