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 
Fic. 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. 
