Figure legend:
Figure 1 . Renal biopsy specimens:
(a) Elastica-Masson trichrome staining showing no typical interstitial fibrosis, inflammatory fibrosis, tubular atrophy, or segmental sclerosis.
(b) Periodic acid-methenamine silver and hematoxylin-eosin staining showing no proliferation of mesangial cells, crescentic glomerulonephritis, or endocapillary hypercellularity.
Figure 2 . The course of the disease.