[Synovial vascularization and inflammation. I. Morphologic study using light and electron microscopy].

The authors studied using light and electron microscopy, 40 cases of sub-acute inflammatory synovitis (including 24 cases of rheumatoid synovitis) and 10 normal synovia. In light microscopy, the study dealt with images of capillary congestion, endothelial hyperplasis and capillary obliterations. In electron microscopy the morphology of the capillaries, the images of plasmic exsudation, images of extravascular cell migration and vascular obliteration by the endothelial cells, were studied in comparison with the inflammatory synovitis and the normal synovia. Inflammatory synovitis are characterized by the frequency of extracapillary cell migrations without there being any other pathological change of the microvessels that can be attributed to inflammation.