ABSTRACT. A 3-month-old female tortoise-shell cat showing azotemia died with a marked swollen abdomen. Necropsy revealed a huge perirenal cyst (8.5 × 6.0 × 4.5 cm) on the ventral aspect of the right kidney. The cyst was filled with the pellucid yellow fluid with a smell of urine. The lumen was connected with irregularly dilated renal pelvis by a narrow channel passing through the renal parenchyma. The cyst was lined by epithelial cells and its wall was consisted of collagen fibers and smooth muscle cells as that of the renal pelvis and ureter. Renal parenchyma adjacent to the channel showed interstitial infiltration of the lymphoid cells. The cyst was a diverticulum of the renal pelvis due to an impaired development. KEY WORDS: feline, perirenal cyst, pyelocaliceal diverticulum.J. Vet. Med. Sci. 67(3): 329-331, 2005 Cystic diseases of the kidney in cats are divided into two types as a renal cyst and a perirenal pseudocyst [5]. The former that may occur in association with inherited, developmental, or acquired diseases is recognized in the renal parenchyma and are defined as a fluid-filled sac lined by an epithelium. On the other hand, the latter has been used to describe renomegaly caused by accumulation of fluid between renal parenchyma and the surrounding capsule so that it had no epithelial lining and the cause of the disorder is not known and the morphogenesis has not been yet fully investigated [1,3,5]. The words of capsulogenic renal cyst, capsular cyst and pararenal pseudocyst, capsular hydronephrosis or perirenal cyst have been used as a synonym of perirenal pseudocyst [5]. In the present report, we describe the perirenal cyst which has not been described before.A 3-month-old female tortoise-shell cat, weighing about 920 g showed a marked swollen abdomen, anorexia and dyschezia for the past month. The cause of abdominal enlargement was identified as accumulation of fluid. To lower intra-abdominal pressure, a total of 800 ml of the fluid was removed by aspiration with a syringe four times over a period of 3 weeks, however the abdominal turgidity showed no signs of recovery. A blood test that was performed 5 days before death showed an elevation in values of blood urea nitrogen (BUN; >140 mg/dl) and creatinine (Cr; 7.1 mg/dl). The cat died 40 days after the first admission.Necropsy was performed two hours after death and confirmed asites (about 15 ml) which was pellucid yellow with a smell of urine, formation of a huge fluid-filled cyst (8.5 × 6.0 × 4.5 cm, weighing about 190 g) on the ventral aspect of the right kidney (Fig. 1), a slightly swollen left kidney and hydrothorax. Accumulated fluid in the cyst of the right kidney was similar in content to that of the ascites (BUN; 43.2 mg/dl, Cr; 2.5 mg/dl). The free wall of the cyst was thin and the inside lining was smooth and white. On the other hand, the visceral cyst wall could not be separated from the right kidney. The lumen of the cyst connected with irregularly dilated renal pelvis through a narrow channel (Figs. 2 and 3). The ventral aspect of th...

The ultrasonic shot peening (USP) technique has been developed for boiling water reactor (BWR) components as a countermeasure against stress corrosion cracking. The effects on residual stress of USP for type 316L stainless steel and alloy 600 were evaluated. Compressive residual stress layer of 0.5 mm from the surface were formed on the specimens after USP using stainless steel ball with a diameter of 3 mm. Cross-sectional hardness measurement revealed that the increase of hardness due to USP is not significant compared with shot peening (SP). The FEM calculation showed the plastic strain induced by the impacts of 3 φ shot with 5 m/s is lower than those of 0.6 φ shot with 50 m/s. It suggests USP process suppresses the degree of work hardening in comparison with SP process. Dissimilar weld joint specimens which simulate the material and dimension of the shroud weld line H7 were examined to confirm the applicability of USP. The experimental result reveals that USP technique is applicable to reactor internal components as stress modification process.

No abstract