This Is MS Multiple Sclerosis Community: Knowledge & Support

But Putnam didn't stop there. With an ingenious idea, he proceeded to study the effects of obstructed venous flow in the cerebral veins of dogs. These animals developed a number of abnormalities many of them similar to encephalitis or multiple sclerosis. His comment at the end of his paper was as follows (5): "The later stages (up to ten months) of the lesions consist of plaques of demyelinization with practically complete preservation of the axis-cylinders and with dense fibrous gliosis confined to the white matter." And he continues with: