Spicular arrangement of amyloid in renal biopsy.

A spicular arrangement of amyloid on the epithelial aspect of the glomerular basement membrane has been seen to a variable degree in silver-stained sections of renal biopsies in eight of 38 patients with amyloidosis. Electron microscopical examination revealed a spectrum of appearances of the amyloid fibrils which would account for this finding. Only two of these eight patients had amyloidosis secondary to chronic infection, a much lower proportion than in the group as a whole. The possibility of confusion with membranous nephropathy is discussed with relevance to possible modes of treatment.