Mesangial proliferative glomerulonephritis in mixed connective tissue disease (MCTD).

A patient who had clinical and serologic evidence for Mixed Connective Tissue Disease (MCTD) developed mesangial proliferative glomerulonephritis with demonstrable immune complexes. Most cases of MCTD with a renal lesion have exhibited membranous glomerular lesions. Since the prevalence of renal involvement in MCTD has ranged from 5-20%, it is possible that too few cases have been studied to describe fully the range of renal lesions seen in this disease entity.