Despite those favourable figures, dilatation of peritubular venules and acute tubular necrosis were demonstrated synchronously in all cases. C4d staining in PTC and arterioles and thrombotic microangiopathy were entirely absent in the study group. Immune complex deposits in peritubular capillaries and in glomeruli were not detected. Three patients had isolated glomerular C4d deposition without accompanying thrombotic microangiopathy and IgG, IgA, IgM, C3, and C1q staining of glomerular capillaries in IF microscopy.