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disease in bearded dragons would be uncommon and that aneurysms would be the most common disease diagnosed and associated with a high mortality rate. 2 , 15 Methods Case selection The electronic medical records at 6 veterinary teaching hospitals

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in American Journal of Veterinary Research
in Journal of the American Veterinary Medical Association
in Journal of the American Veterinary Medical Association

Abstract

Objective—To characterize structural changes in pulmonary vessels of dogs with dirofilariosis.

Animals—8 dogs with dirofilariosis and 2 unaffected control dogs.

Procedure—Pulmonary artery pressure was measured in affected dogs, and dogs then were euthanatized. Scanning electron microscopy was used to examine vascular corrosion casts of pulmonary vasculature. Tissue sections of pulmonary vasculature were evaluated by use of histologic examination.

Results—Pulmonary artery pressure was higher in dogs with severely affected pulmonary vessels. In tissue sections, dilatation, as well as lesions in the tunica intima and proliferative lesions resulting in constriction or obstruction, were frequently observed in branches of the pulmonary artery. Numerous dilated bronchial arteries were observed around affected pulmonary arteries. Hyperplastic venous sphincters were observed in small pulmonary veins and venules. In corrosion casts, affected pulmonary lobar arteries had dilatation, pruning, abnormal tapering, constriction, and obstruction. In small arteries and arterioles, surface structures representing aneurisms and edema were seen. Bronchial arteries were well developed and extremely dilated, and they formed numerous anastomoses with pulmonary arteries at all levels, from the pulmonary trunk to peripheral vessels. Capillaries in the lungs were dilated with little structural change. Small pulmonary veins and venules had irregular annular constrictions that were caused by hyperplastic smooth muscle cells of venous sphincters.

Conclusions and Clinical Relevance—Scanning electron microscopy of microvascular casts delineated links between the bronchial and pulmonary circulations in dogs with dirofilariosis. Results of scanning electron microscopy provided a structural explanation for the development of pulmonary circulatory disturbances and pulmonary hypertension in dogs affected by dirofilariosis. (Am J Vet Res 2002:63:1538–1544)

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in American Journal of Veterinary Research

structure within the cranial mediastinum was given to congenital or traumatic diverticular cranial vena cava aneurysm with secondary impaired venous return causing congestive hepatopathy, bicavitary effusion, and azygous, caudal caval, and hepatic venous

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in Journal of the American Veterinary Medical Association

indicates distance in centimeters. Determine whether additional imaging studies are required, or make your diagnosis from Figure 1 —then turn the page → Diagnostic Imaging Findings and Interpretation An aneurysm of the right aortic sinus is

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in Journal of the American Veterinary Medical Association

thick-walled aneurysm partially visible cranial to the heart (B). The aneurysm is partially obscured by a shadowing artifact caused by the bearded drag-on's sternum. Comments Pericardiocentesis was performed with ultrasound guidance and

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in Journal of the American Veterinary Medical Association

' cross striations (arrow). Phosphotungstic acid–hematoxylin stain; bar = 50 μm. Morphologic Diagnosis and Case Summary Morphologic diagnosis: basilar eccentric hypertrophy of the LV with marked bulbous dilation (ballooning or aneurysm) of the

Full access
in Journal of the American Veterinary Medical Association