[Reiter's syndrome: the clinico-histomorphological correlations].

A total of 11 patients with Reiter's syndrome underwent puncture biopsy of the synovial membrane of the knee joint. At the early stage of the disease the patients showed hyperemia, edema, infiltration with neutrophilic leukocytes, lymphocytes and plasmacytes. At the later stage diffuse and focal infiltrates of lymphocytes and plasmacytes and a rise of the fibrocyte count were predominant.

[Electron-dense deposits in membranous nephropathy: mode and site of the deposit].

Some facts were established, with the electron microscopic studies on punch biopsy material from patients with idiopathic membranous nephropathy, that cannot be explained by Karnowsky theory about the two filters of glomerular capillary wall--rough basal membrane and fine podocyte. Those facts are: I. Multilayer, one upon the other, build up of dense material; 2.

[Crescents in focal (mesangiopathic) glomerulonephritis].

The main pathological alterations in focal glomerulonephritis are found in mesangium. The capillary walls are almost intact or slightly affected. In spite of that the epithelial crescents in that diseases are very frequent.