After brief considerations about neurologic manifestations in periarteritis nodosa, three cases with involvement of peripheral nerves are reported. Between the peripheral nerves syndromes the multiple peripheral neuritis (mononeuritis multiplex) is stressed and two cases are studied (cases 1 and 3). Case 2 was characterized by polyradicular involvement (polyradiculo-neuritis). Case 3 was characterized by the association of multiple peripheral neuritis with jugular foramen syndrome; there is not an alike case related in the medical literature. The correct diagnosis, in all cases, was made through histological examination. Necroscopic findings are reported in two eases. Clinical features are discussed.