All of the following statements about lymphoepethelioma of the parotid gland are true, except

The use of the word 'benign' to describe this lesion is misleading because 20% of patients with benign lymphoepithelial lesion ultimately develop lymphoma. It is not possible to distinguish on histological grounds benign lymphoepithelial lesion from Sjogren's syndrome. Both are characterised by lymphocytic infiltration, acinar atrophy and ductal epithelial proliferation. Clinically, benign lymphoepithelial lesion presents as a diffuse swelling of the parotid gland. The swelling is firm, often painful and, in 20% of patients, the presentation is bilateral. Most patients are female and over 50 years of age. Parotidectomy is often undeaken to establish a diagnosis. Prolonged follow-up is essential.It can occur in HIV patients ; lymphoepitheli all diseases and in Sjogren's syndrome.Total parotidectomy with radiotherapy. SRB,5th,421.