Figure 912

Electron microscopy of subendothelial and endocapillary deposits showing an amorphous structure. In a minority of cases, as illustrated here, a specific annular and cylindrical structure is shown. This structure is identical to that seen in the in vitro precipitate of the same patients and consists of cylinders 100- to 1000-^m long, with a hollow axis, appearing in cross-sections as annular bodies [16]. (Uranyl acetate-lead citrate X 22,000.) (Courtesy of Department of Pathology, San Carlo Borromeo Hospital, Milan, Italy.)

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