Synchronous unilateral basal cell adenoma of the parotid gland: A case report

Abstract

The current study reports the case of a 68-year-old male who presented with a 4-month history of a painless slow-growing mass in the left parotid region. Magnetic resonance imaging revealed two independent, round lesions in the superficial and deep lobes of the parotid gland on the left side, respectively. A total parotidectomy was performed and basal cell adenomas (BCAs) were identified by histopathological examination. At the 6-month follow-up examination, no sign of recurrence was found. This study describes the clinical features of a rare case of synchronous unilateral BCA in the parotid gland and also provides a review of the literature.

Keywords: basal cell adenoma; parotid gland; synchronous.

Figure 1

(A) Axial T1-weighted magnetic resonance imaging showing two independent masses in the superficial and deep lobes of the parotid gland on the left side. The two tumors were well-marginated. (B) Coronal T2-weighted magnetic resonance imaging showing moderate enhancement in the peripheral component and signal hypointensity in the central component of the two tumors.

Figure 2

Immunohistochemical staining. The tumor was positively stained for (A) smooth muscle antigen, (B) cluster of differentiation 117, (C) calponin, (E) carcinoembryonic antigen and (G) p63. The tumor was negative for (D) Ki-67, (F) epithelial membrane antigen and (H) p53 (magnification, ×20).

Figure 3

Hematoxilin and eosin staining (magnification, ×20) showing the epithelial tumor separated by stromal tissue, and basaloid cells dispersed in an external stockade pattern.