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Abstract
Utilizing transmission electron microscopy we have found multiple cilia with a 9 + 2 microtubular pattern (the same type found in the bronchial tree) in the renal tubules of four adults with the nephrotic syndrome. Each patient had a different pathologic diagnosis: amyloidosis, lipoid nephrosis, membranoprolif-erative glomerulonephritis, and focal segmental glomerulosclerosis. Previously, multiple renal tubular cilia with 9 + 2 architecture had been reported in patients with Burnett's syndrome, systemic lupus erythematosus, and congenital nephrotic syndrome. Additionally, we found multiple cilia in the metanephric tubules of 4 of 4 human fetuses. Pathologists should be aware that cilia with various microtubular patterns occur in human adult kidneys.