Observations on vascular neuropathies.

: A series of autopsy studies is presented of 13 cases of obliterative vascular disease of the vasa nervorum in a wide range of conditions, including polyarteritis nodosa, Wegener's granulomatosis, lymphomatoid granulomatosis, polymyositis and rheumatoid arthritis. In most cases, including 1 of rheumatoid neuropathy, the lesions were of the necrotising type. This supports the concept of polyarteritis nodosa as a pattern of reaction common to several diseases rather than that of a specific nosological entity. The remaining 4 cases of rheumatoid neuropathy, were associated with a bland endarteritis known as Bywater's arteritis. A comparison of these autopsy findings with clinical data and observations on sural nerve biopsies leads to the conclusion that all severe and most of the mild cases of rheumatoid neuropathy are due to occlusive vascular disease. Segmental demyelination independent of vascular lesions may be responsible for some of the mild cases and is frequently found in patients without clinical neurological manifestations.