TUMOURS AND CANCERS. 



229 



large and two small calculi. One calculus is lodged in 

 the lower end of the left ureter, obstructing it. In con- 

 sequence of this, the retained fluid has dilated the ureter, 

 and the pressure has induced absorption of the secreting 



FIG. 116. The kidneys, ureters, and bladder of a Terrier. 

 The bladder contains calculi, one of which, C, obstructs 

 the left ureter, and has induced a cystic condition of the 

 kidney. (Mus. Royal College of Surgeons.) 



tissue of the corresponding kidney, which has become 

 transformed into a hollow bag, or cyst, filled with fluid. 

 This condition of the kidney will arise from any cause 

 obstructing the free flow of urine. 



