[Primary malignant lymphoma localized in the trunk of the ulnar nerve at the elbow. A case report].

The subject of this report is the exceptional observation of an ulnar nerve syndrome in the right elbow induced by the intra and extra neural development of a primary malignant lymphoma. The patient is a man of sixty-eight. The syndrome evolved over one year. The electromyogram showed marked slowing of the conduction speed on the ulnar nerve. The operation unabled us only to carry out a partial biopsy resection. Complementary chemotherapy was then carried out making a survival of two years and seven months possible without any sign of recurrence or other sites. We have only been able to locate two other published cases of primary malignant lymphoma developing on a nerve trunk and more precisely in on the level of the sciatic nerve. No other case has been described in a nerve trunk in the upper limb.