Pattern of double glomerulopathies. A clinicopathologic study in nine nondiabetic patients.

Nine new cases of double glomerulopathies (GP) were found among 1,715 renal biopsies. Immunofluorescence and electron microscopy were needed to achieve a correct diagnosis and the prevailing relevance of these techniques in single cases was stressed. IgA nephropathy was the most commonly found GP, being associated with membranous glomerulonephritis (GN) (2 patients), minimal change disease (3 patients), and focal segmental glomerulosclerosis (1 patient). In addition, single cases of membranous GN plus crescentic GN and acute GN plus cryoglobulinemic GN were recorded. Possible factors involved in the pathogenesis and clinical significance of double glomerulopathies are discussed.