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Light microscopic examination of the renal tubular epithelium of a female with a rapid progressive glomerulonephritis revealed in several areas the presence of cells bearing ciliumlike structures.At transmission electron microscopy, normal tubular cells appeared to be partially replaced by epithelial cells showing numerous 9×2 cilia and a normally developed basal apparatus. The cilia showed several ultra-structural details (i.e., outer dynein arms, spokes) such as observed in kinocilia of the respiratory epithelium. In addition, a number of poorly differentiated cells showing cilia with a 9 + 0 pattern and at the same time cilia with a 9 + 2 pattern of microtubular arrangement were also seen.The possible biologic significance of these cilia is discussed.