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Journal Article
Research Support, Non-U.S. Gov't
Glomerular crescents in renal amyloidosis: an epiphenomenon or distinct pathology?
Pathology International 2001 March
There have been several reports of cases of renal amyloidosis with glomerular crescents. However, it is not clear whether the association is fortuitous or pathogenic related. The present study analyzed 105 cases of renal amyloidosis (61 autopsy cases and 44 biopsy cases) and found glomerular crescents in 14 (13.3%) cases. Among the 14 cases with crescents, a female predominance was noted (male: female, 3: 11) and rheumatoid arthritis was the most common primary disease of amyloidosis. Immunohistochemical analysis demonstrated amyloid protein of AA type in 12 cases. According to the histologic classification, there were 11 cases of mesangial nodular type, which was almost exclusively accompanied by AA amyloid deposition. Of note, the incidence of crescents neither correlated with the extent of amyloid deposition nor the presence of nephrotic syndrome. By contrast, localization of amyloid deposition was closely related to crescent formation. Moreover, electron microscopic observation displayed rupture of the glomerular basement membrane at the site of amyloid deposition. Our results indicated that glomerular crescents were more frequently associated with renal amyloidosis than previously appreciated. Rupture of the fragile glomerular basement membrane by amyloid deposition, as revealed by immunostaining and electron microscopy, may be the mechanism of crescent formation. We suggest that glomerular crescents are a distinct pathology associated with renal amyloidosis, not fortuitous conditions.
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