Hyperechoic Retroperitoneal Fat in a Cat with Systemic Coagulopathy.

Hyperechoic retroperitoneal fat was identified in a 3 yr old Sphynx cat with systemic coagulopathy. This ultrasonographic finding preceded the development of hematochezia and anemia, and pleural and peritoneal bleeding did not develop. Fine-needle aspirate cytology of the retroperitoneal space showed a predominance of erythrocytes, and rapid clinical recovery was noted following treatment with plasma, a whole blood transfusion, and vitamin K. Systemic coagulopathy should be considered a differential for hyperechoic retroperitoneal fat in cats, even in the absence of other clinical manifestations of hemorrhage.