Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . a, Fatty casts; b, waxy casts.Fatty and Waxy Casts. 336 PHYSIOLOGICAL CHEMISTRY. constitute a true fatty cast the deposited material must coverthe greater part of the surface area of the cast. The presenceof fatty casts in urinary sediment indicates fatty degenerationof the kidney; such casts are particularly characteristic of sub-acute and chronic inflammations of the kidney. Fig. 114.. Cylindroids. (After Peyer.) (f) Waxy Casts.—These casts posse
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Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . a, Fatty casts; b, waxy casts.Fatty and Waxy Casts. 336 PHYSIOLOGICAL CHEMISTRY. constitute a true fatty cast the deposited material must coverthe greater part of the surface area of the cast. The presenceof fatty casts in urinary sediment indicates fatty degenerationof the kidney; such casts are particularly characteristic of sub-acute and chronic inflammations of the kidney. Fig. 114.. Cylindroids. (After Peyer.) (f) Waxy Casts.—These casts possess a basic substancesimilar to that which enters into the foundation of the hyalineform of cast. In common with the hyaline type they are color-less, refractive bodies but differ from this form of cast in be-ing, in general, of greater length and diameter and possessingsharper outlines and a light yellow color (Fig. 113, p. 335).Such casts occur in several forms of nephritis but do notappear to characterize any particular type of the disorder ex-cept amyloid disease, in which they are rather common. (g) Pus Casts.—Casts whose surface is covered with puscells or leucocytes are termed pus casts (Fig. m, p. 334. Theyare frequently mistaken for epithelial casts. The differentia- URINE : SEDIMENTS. 337 tion between these two types is made very simple howeverby treating- the cast with acetic acid which causes the nuclei ofthe leucocytes to become plainly visible. The true pus cast isquite rare and indicates renal suppuration. C