Isolated malignant lymphoma of the jejunum and long-term diphenylhydantoin therapy.

We report a case of isolated malignant lymphoma of the jejunum occurring 18 18 months after continuous diphenylhydantoin therapy for epilepsy. Although this association may be purely coincidental, we suggest a possible causal relationship between the two in light of current knowledge about the immunological aberrations that may be caused by prolonged administration of diphenylhydantoin in man.