A large urolith in an eight year-old mare: a case report

A micturition problem appeared in an eight year-old mare at the third month of pregnancy. Symptoms intensified during the course of pregnancy and, at the end of the tenth month, the foetus was aborted. Labour was ordinary with normal presentation, position and posture, yet there was a formation about the size of an ostrich egg. The structure was spontaneously pushed out of the genital tract during expulsion of the foetus. Examination of the structure showed that it was a urolith which measured 13 x 10 x 7 cm (circumference measured along the long axis amounted to 31.5 cm, and along the transverse axis to 26 cm) and weighed 803 g.