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©2013 UpToDate ® Print Email Capillary microthrombi in mixed cryoglobulinemia Light micrograph in mixed cryoglobulinemia showing large cryoprecipitates occluding many of the capillary loops (arrows), called microthrombi. Courtesy of Helmut Rennke, MD. Normal glomerulus Light micrograph of a normal glomerulus. There are only 1 or 2 cells per capillary tuft, the capillary lumens are open, the thickness of the glomerular capillary wall (long arrow) is similar to that of the tubular basement membranes (short arrow), and the mesangial cells and mesangial matrix are located in the central or stalk regions of the tuft (arrows). Courtesy of Helmut G Rennke, MD.