Benign lymphoepithelial cyst of parotid gland without human immunodeficiency virus infection: A case report

Table 1 Clinical and pathological data of this case of benign lymphoepithelial cyst of the parotid gland

	Finding
Age, sex	44 years, male
Family history	None
Personal history	None
Chief complaint	Left neck painless mass present for 1 year
Physical examination	A quail egg-shaped mass on the left parotid gland, about 2.0 cm × 2.0 cm in size, tough, without tenderness, easily moveable, no local redness, swelling, heat or pain, and no abnormalities in the contralateral parotid gland
Laboratory examinations	HIV tests, including antibody and nucleic acid tests and CD4+ T cell examination, were negative
Ultrasound of the neck	A 2.2 cm × 2.2 cm hypoechoic mass in the left parotid gland, with a clear boundary, coarse calcification foci, and no blood flow signal (Figure 1)
Neck CT	A round cystic lesion in the left parotid gland, with a maximum cross-sectional area of 2.3 cm × 2.2 cm, uneven density, small patches with slightly high-density shadows, and clear boundaries (Figure 2A). On enhanced scanning, the cyst wall was slightly enhanced in the arterial phase, but no obvious enhancement was observed in the cyst (Figure 2B). The enhancement degree in the venous phase was similar to that in the arterial phase (Figure 2C)
Pathology	The cyst wall was laminated squamous epithelium without epithelial nail process and the surface layer was mostly incomplete keratosis (Figure 3A); The epithelium was surrounded by a large number of lymphoid stromata with lymphoid follicular formation and a center of occurrence (Figure 3B)
Final diagnosis	Non-HIV-infected BLEC of parotid gland
Treatment	Surgical treatment (specific surgical method was termed left parotid gland tumor + partial superficial lobectomy + facial nerve exploration and protection + fascia flap plasty)
Follow-up	No recurrence of symptoms in 2-year clinical follow-up

HIV: Human immunodeficiency virus; CT: Computed tomography; BLEC: Benign lymphoepithelial cyst.