Untersuchungen über die Altersamyloidose des Hundes und ihre Stellung zur sog. typischen Amyloidose

Amyloid in canine mammary tumors

In canine mammary carcinomas, amyloid was present as amyloid-containing corpora amylacea and as local deposits between neoplastic epithelial cells or in stromal tissue. Histochemical staining methods revealed that this amyloid was not of the AA-type amyloid and contained tryptophan. The possible pathogenesis of this amyloid deposition is discussed.

Spontaneous amyloidosis of mammals

Spontaneous amyloidosis is known in more than 30 mammalian species. Various patterns of mammalian amyloidosis are reviewed. On the basis of the anatomical distribution of the amyloid deposits a distinction is made between patterns with typical amyloid distribution, patterns with atypical distribution, and so-called intermediate or mixed patterns. Staining, histochemical, and electron microscopic properties of amyloid and possible etiological factors of amyloidosis in different mammalian species are briefly discussed.

[Amyloidosis of heart valves in dog]

Histological examination of 80 dogs with endocardiosis showed five cases of amyloidosis of the heart valves. The diagnosis was based on positive reactions of several stains and histochemical tests and the demonstration of a characteristic fibrillar structure in the amyloid deposits with the electron microscope. The possible pathogenetic relationship of valvular amyloidosis to endocardiosis in aging dogs is discussed.