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Oncocytic tumour

- Oncocytic epithelial cells are more often seen in papillary fragments, acini and singly in comparison to Warthin's, where sheets of oncocytic cells are observed.

- A degree of epithelial atypia can be seen in oncocyte predominant benign lesions.

- Oncocytoma can show a pseudomalignant change that mimics acinic cell carcinoma.