A 9-year-old spayed female domestic shorthair cat was admitted for evaluation following a 2-month history of intermittent pollakiuria, stranguria, and observation of a mass in the caudoventral aspect of the abdomen. The abdominal mass would vary in size, and when palpated by the owner, the cat would urinate. On physical examination, a large, firm mass was palpated along the ventral midline just caudal to the umbilicus. The overlying skin was mildly bruised. Radiographs of the abdomen were obtained (Figure 1).
Left lateral (A) and ventrodorsal (B) radiographic views of the abdomen of a 9-year-old spayed