This benign epithelial tumour is the most common tumour of the parotid gland. It may present at any age, normally as a painless, slowly growing, firm lump with a smooth surface with no deep tissue fixation. Rarely, the tumour may be soft and feel cystic. Distant metastases are very rare but local recurrence following enucleation is common. This is because the slowly expanding tumour compresses surrounding salivary tissue, forming a pseudo-capsule through which the tumour may penetrate. Occasionally this benign tumour can undergo malignant transformation.
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