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Ultrastructure of leprous phlebitis.

An ultrastructural study on vein biopsies from six lepromatous leprosy patients was carried out. The results showed that a) the lumen-lining bacillated cells were endothelial in origin due to the presence of specific Weibel-Palade endothelial cell granules; b) endothelial cells released Mycobacterium leprae into the lumen by exophagocytosis; c) M. leprae were able to grow and multiply in the endothelial and smooth muscle cells; and d) smooth muscle cells did not show any evidence of reaction due to the presence of M. leprae in their cytoplasm.