Oncocytoma parotid gland: a rare entity
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Very few cases of parotid oncocytoma have been reported in literature. Because of its rarity (<1% of salivary gland tumors) and clinical presentation of the tumor, there is a tendency among the clinicians to misdiagnose it as pleomorphic adenoma, hemangioma, or other forms of oncocytosis.

Only a histopathological examination can confirm it. Published in the Annals of Maxillofacial Surgery, the authors evaluate here a case of swelling of the parotid gland in a 70-year-old male who had the tumor for over 9 years to reach a diagnosis.

A 70-year-old male reported to the ENT department with a mass near the angle of the mandible on the left side for 9 years. It was a painless swelling which had an insidious onset but not increasing in size for the last many years. The patient had no other significant complaints. On examination, a solitary 3 cm × 2 cm-sized left parotid mass, posterior to the angle of the mandible, was present.

It was a nontender, nonfluctuant, nonpulsatile swelling with regular margins. It was not adherent to overlying skin or underlying structures. No signs of facial palsy were seen. FNAC report was suggestive of oncocytic neoplasm. On contrast-enhanced computerized tomography (CECT), a rounded hyperdense lesion in the superficial lobe of the left parotid was seen which according to radiologist could be benign parotid neoplasm, hemangioma, or enlarged lymph node (CECT scan showing tumor in the left parotid gland).

Ultrasonography identified a 2.5 cm × 1.7 cm-sized lobulated solid mass in the left parotid region which was closely abutting left parotid gland and was very vascular. Based on the above-mentioned findings, a provisional diagnosis of oncocytoma in the left parotid was made with differential diagnosis of hemangioma, and the patient was worked up for superficial parotidectomy.

Superficial parotidectomy was done with preservation of the facial nerve. Excised mass was sent for histopathological examination, which confirmed it as oncocytoma.

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