Pleomorphic adenoma

90% found in parotid. 60% of parotid tumours.

Features

Small, painless, slow growing lump, usually over angle of mandible.

Pathology

Fine needle aspiration. Epithelial nests or cords in a hyaline or chondroid matrix.

Complications

May grow to grotesque size if left. Carcinomatous transformation (10% at 15 years). Local recurrence common (up to 25%). Gustatory sweating (7%).

Treatment

Excision. Resistant to radiotherapy.