Periphlebitis retinae in multiple sclerosis. A histopathological study of two cases.

The reported findings of periphlebitis retinae (PR) at autopsy, in which brain autopsy was also performed, in 2 patients with multiple sclerosis (MS) are, so far as the authors are aware, the first histological account of this manifestation of the disease. The similarity between the cellular accumulations around the veins of the central nervous system seen in multiple sclerosis and the periphlebitic cellular accumulations here described suggests that periphlebitis is an initial event in plaque formation.