TMSS Medical College Journal

Abstract Tumors of parotid glands are majority benign and commonest of them is Pleomorphic adenoma. Parotid Oncocytoma is a rare parotid tumor with incidence of 0.1-1.5% (rarest of salivary tumor type) of all parotid tumors, and it occurs in 6-8 decade of life. Patients commonly presents with a painless swelling in face. Because of its rarity and clinical presentation of tumor, there is a tendency to misdiagnose it. Only histopathology can confirm it. In these two case reports we have presented a case of 21 years old male and a 31 years old female with painless swelling in parotid gland and diagnosis of Oncocytoma has confirm by Histopathological examination.

Salivary gland neoplasm represents the most complex and diverse group of tumors encountered by head-and-neck surgeons. Their diagnosis and management is complicated by their relative infrequency (1% of head and neck tumors), the limited amount of pretreatment information available, and wide range of biological behavior seen. Oncocytoma is predominantly composed of oncocytic cells lining the salivary ducts. The prefix onco is derived from the Greek word onkoustai, which means to swell. The term ‘Oncocytoma’ was proposed by Jaffe. Meza Chavez later proposed the term ‘Oxyphilic granular cell adenoma’? They are predominantly tumors that occur in those who are middle aged and above. ‘Women, usually in the seventh or eighth decade, are likely to be affected. These tumors are slow growing and may rarely be bilater.! Apart from the major salivary glands, oncocytes are also found in a great number of locations in the body such as respiratory tract, mammary glands, thyroid gland, pancreas, parathyroid gland, pituitary gland, testicle, fallopian tube, liver and stomach.’ Physical examination usually reveals a painless, slow growing, non-tender, firm, lobulated, and mobile mass, but sometimes the patient refers to a clinician for the development of pain and/or facial nerve paralysis. Such symptoms were initially regarded as criteria of malignancy but later were observed in combination with benign tumors, such as Warthin’s tumor, pleomorphic adenoma, lipoma, and PGO.* Alternative designations for the tumor are oncocytic adenoma, oxyphilic granular-cell adenoma and oxyphilic adenoma® Diagnosis is confirmed by histological examination after parotidectomy.® We are presenting these two cases of parotid oncocytoma because both of them are young which is not common and we have to confirm the diagnosis after histopathology.