硝子 円柱。 尿沈渣アトラス:IV 円柱類

The differing shade of staining appears to be due to the difference in the concentration of protein in the matrix and the concentrating power. Fatty granules show a birefringence polarized image called a Maltese cross and appear to be cholesterol esters or phospholipids. Epithelial casts encapsulating renal tubular epithelial cells are found in the tubular cavities. There are hyaline casts well-stained with eosin in the renal tubular lumens. They are identified as tubular epithelial cells based on the thick cytoplasm and irregular sizes. Care must be taken during observation because the structure is easily overlooked if the light source is too bright. When unstained, differentiation from leukocytes is necessary. Because it is enclosed in a hyaline cast, it is presumed to be a cast reconstituted in the lower nephron. A rectangular plate-like cholesterol crystal is also enclosed in the cast, but there is only one cholesterol crystal, so this specimen is reported as a fatty cast and cholesterol crystal. Infiltration of inflammatory cells, which are mainly composed of lymphocytes, are observed in the interstitium. Interstitial fibrosis and inflammatory cell infiltration are not observed. The matrix structures appear thin. That is possible because epithelial cells have clear cytoplasm margins and swollen nuclei. Differentiation from macrophages is necessary.。

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