An oncocytoma (oxyphil cell adenoma, oxyphillic granular cell adenoma) is a benign tumour that can occur in the conjunctiva, the lacrimal gland and the lacrimal sac [7, 111]. It presents as an asymptomatic, slowly progressive swelling of the caruncle in older persons. The lesion consists of large epithelial cells with eosinophilic, granular cytoplasm, due to a large number of mitochondria. The cells can be arranged in cords, sheets or nests. Ductal and cystic glandular structures can be found. The malignant variant of this tumour, the oncocytic adenocarcinoma of the lacrimal system is very rare.

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