Veterinary Pathology

Lamar, C. H.; Van Sickle, D. C.

doi: 10.1177/030098587501200101pmid: 1166569

Clumps of chromatin in the spinal cord of 2- to 10-day-old pigs with congenital tremor were of no diagnostic value since they were present also in unaffected pigs of the same age. No differences in shape, size, number, location, and staining characteristics of the clumps were found. The clumps were thought to be evidence of cellular necrobiosis. The cords of pigs with tremor had distinctly less myelin than those of normal pigs.

Moe, J. B.; White, J. D.; Czajkowski, W. P.; Stookey, J. L.

doi: 10.1177/030098587501200102pmid: 809897

A myxosarcoma that arose spontaneously in the ilial region of a young male Rhesus monkey grew rapidly and invaded and lysed the pelvic bones. It consisted of large pleomorphic cells, with single or multiple nuclei and dilated rough endoplasmic reticulum, in abundant intercellular matrix.

Weisbroth, S. H.

doi: 10.1177/030098587501200103pmid: 1166570

Torsion of the caudate lobe was an incidental necropsy finding in three livers of 984 rabbits. The affected rabbits were mature (18–24 months), without a common background, and did not have clinical signs related to hepatic torsion. No lesions secondary to lobar torsion were seen.

Yaeger, J. A.; Church, R. L.; Tanzer, M. L.

doi: 10.1177/030098587501200104pmid: 170727

Clonal cell lines from the dermis of a dermatosparaxic calf were grown in tissue culture. After fixation in a mixture of glutaraldehyde and osmium, they were prepared for electron microscopy. Most cells contained a well-developed Golgi region, lysosomes, mitochondria, and dilated cisternae of rough endoplasmic reticulum. They also contained numerous, large bundles of intracellular filaments, many lipid droplets and extensive arrays of vesicles. Cultures accumulated substantial amounts of extracellular fibrillar material. The fibrils were loosely packed and indistinctly cross-banded. Bundles of intracellular filaments were commonly parallel in adjacent cells and also parallel to extracellular fibrils. These cytoplasmic features may result from the inability of the secreted collagen to form normal fibrils.

Toft, J. D.; Kenzie, W. F. Mac

doi: 10.1177/030098587501200105pmid: 1166571

A 25-year-old female chimpanzee with disseminated tuberculosis also had two uterine tumors. One was a typical leiomyoma and the other, which occluded the uterine lumen, was composed of cells resembling normal endometrial stroma in its proliferative phase. It was diagnosed as an endometrial stromal tumor and was similar to that which occurs in the human female. This is the first report of this lesion in a nonhuman primate.

Wright, L. J.

doi: 10.1177/030098587501200106pmid: 1166572

The intimal surface of the aortic arch of 16 of 20 male common brown hares and 10 of 14 females had raised pale yellow to grey-white plaques up to 6 mm in diameter. These lesions were characterised by necrosis and calcification mainly in the tunica media and were not related to the age of the hares. In the hare this vascular disease may develop after injury to the connective tissue during obliteration of the ductus arteriosus. Although these aortic lesions were not the ‘spontaneous’ atherosclerotic variety they were morphologically similar to those in rabbits.

Meyer, R. C.; Simon, J.; Byerly, C. S.

doi: 10.1177/030098587501200107pmid: 1167199

A disease resembling swine dysentery occurred in gnotobiotic piglets previously colonized with Escherichia coli and given a mixture of five enteric anaerobes and spirochete B-78, orally. No disease occurred in germ-free piglets exposed to four Gram-negative obligate anaerobes or to the spirochete; however, if the four respective anaerobes were introduced into gnotobiotic pigs previously colonized with the spirochete, or when the spirochete was introduced into gnotobiotic pigs colonized with the anaerobes, a disease occurred that simulated swine dysentery. Swine dysentery is probably caused by the specific interaction of one or more enteric Gram-negative obligate anaerobes and a spirochete.

Mandal, P. C.; Singh, Balwant

doi: 10.1177/030098587501200108pmid: 1166573

Mandal, P. C.; Singh, Balwent

doi: 10.1177/030098587501200109pmid: 1166574

Cimprich, R.; Ardington, P.

doi: 10.1177/030098587501200110pmid: 1166575