Narrowed and rudimentary portal vein branches were observed in the livers of specified-pathogen-free rats which, at the age of 6-11 weeks, showed poor condition and retarded growth. At autopsy abdominal venous dislension and congestion suggestive of portal hypertension and collateral circulation appeared to have developed. The cause of the observations and their significance in view of the use of the rats are unknown.
In a male canary, aged 6 years, the renal glomeruli were normal in number and distribution but every single glomerulus was deformed. Most glomeruli had two or more vascular stems, With either deformation of one coherent tuft (Fig. 1) or formation of several tuft-like structures within one Bowman's space (Fig. 2). The presence of numerous arterioles also resulted in the development of glomeruli with a new Fig. 1.-Deformation of one coherent glomerular tuft, possessing 2 vascular stems. (P.A.S., x400) FI 9-2-Production of several underdeveloped bizarrely-shaped tuft-like structures, each with its own vascular stem.
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