Spleens of 76 tuberculosis cases autopsied in our sanatorium were examined hiscologically with attention to the cells of reticuloendothelial system and tubercles.
Results were as follows;
1) Tubercles were found in follicle (31 cases), in pulpa (31 cases), in trabecula (10 cases) and at the periphery of the follicle (34 cases). The periphery of the follicle was most frequently involved. In the same spleen, many parts were seen simultaneously involved by tubercles. The tubercles at the periphery of the follicle extended to the central part of the follicle as well as to the pulpa.
2) By observation with silver impregnation method, elipsoids (sheathed arteries) were proved in many tubercles. It is recognized that the reticulum fibrils of the elipsoids transformed into fibrils which consisted the tubercles, and tubercles developed along the elipsoids which showed swelling and proliferation of reticulum fibrils. The relation between tubercles and elipsoids was more clearly observable in the early tubercles than in the old ones. Most tubercles in follicles developed at their periphery, and many tubercles in pulpas localized near the follicles. Elipsoids were proved in the trabecular tubercles.
3) There were proliferation of reticulum cells around the early small tubercles in the follicle. These cells were found also in the tubercle. The protoplasmatic projection of reticulum cells inside and outside of the tubercle were connected tvith each other. In some cases, focal proliferation of reticulum cells, which shall be regarded as atypical or early tubercle, were found near the follicles. Old tubercles contained many reticulum cells or histiocytes and had not clear borders. Fibrous network of the tubercles sprerded into the surrounding tissues. These findings indicate that reticulum cells have a important role in the formation of tubercle.
4) Follicles showed the tendency of atrophy, decrease of lymphocytes and increase of reticulum cells. Hypertrophied follicles were observed in cases with slight tuberculous changes in other organs.
5) In the spleen in which follicles were heavily involved, the cell proliferation and infiltration around the elipsoids were found.
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