What is a key feature of fatty casts?

Fatty casts are abnormal structures that can be identified in urine sediment and are primarily associated with renal conditions involving damage to the renal tubules. A key feature of fatty casts is that they contain fat cells, which are seen as refractile droplets under the microscope. These droplets indicate the presence of lipid accumulation, often linked to diseases such as nephrotic syndrome, where high levels of lipids circulate in the bloodstream and eventually leak into the urine.

The detection of fat cells within casts is significant because it helps veterinary professionals assess kidney function and diagnose possible underlying issues affecting an animal's health. Recognizing the presence of fatty casts in a urine sample can provide valuable insights into the metabolic or nephrological conditions the animal may be facing.