Concretion is described in 9 guinea pigs out of approx. 150 guinea pigs radiographed; High density in the urinary bladder in 3 rabbits.
Case GP 1
A neutered male presented with pain associated with defecation. Radiographs revealed a urinary bladder calculus and irregular higher density areas bilateral to the rectum. The urinary calculus was removed but the animal still painful during defecation. At post mortem both anal sacs were found with hard concrements. Size, shape and location were at the density observed on the radiographs.
Case GP 2
A 4 years old male guinea pig had dysuria and stranguria. Abdominal radiographs showed a high density 6 x 14 mm around the os penis. After content removed from the preputial cavity normal radiological findings around the os penis was observed and the animal had no clinical symptoms.
Case GP 3 - 9
These 5 male and 2 female guinea pigs were of different age but were radiographed due to other reasons than urinary tract problems. They showed minor concretions in their prepuce cavity and urinary excretion system.
Case Rabbit 1 - 3
Three rabbits were presented with coloured and opaque urine. No other abnormal clinical signs. On radiographs their bladders were visualized with varying but high density.
Discussion
The urinary bladder stones in the male guinea pig are located in the bladder, but in the female, the stone can be located very caudally in urethra. The existence of the Perianal Glands is debated. We found Perianal Glands in male Guinea Pigs only. Smegma is a normal fatty oily substance, which some authors claims is produced by the mucilaginous/sebaceous glands, Tyson's glands. The infection in relation to smegma seems in animals to be mycobacterium, but no specific organism was found in this material. The Tyson Glands could not be found in these Guinea Pigs. High density and opaque urine is due to an excretion of surplus of Calcium.
Conclusion
In case of tenesmus in Guinea Pig concretion-conditions should be considered. In rabbits with high radiological density in the urinary bladder the clinical symptoms can be unspecific and due to excretion of calcium.