Six cases of undifferentiated carcinoma of the parotid gland with heavy lymphocytic infiltration have been treated at Montreal General Hospital over the past 23 years. A thorough review of the literature revealed another 31 similar cases which are discussed. For unknown reasons, these malignant tumors seem to be more common in North American Inuit. Their relatively better prognosis may be attributed to the protective function of the heavy lymphocytic infiltration. Surgery has been the treatment of choice with postoperative radiotherapy in indicated cases. Longer follow-up is necessary to assess the role of lymphocytic infiltration in improving survival.
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