Fat stranding refers to an abnormal increased attenuation in fat, (in the mesentery, omentum, retroperitoneum, or subcutaneous fat). The underlying pathophysiologic process is increased edema and engorgement of lymphatics. Abdominal fat stranding can produce various appearances.

What does fat stranding on a CT scan mean?

Fat stranding is a sign that is seen on CT. It describes the change in attenuation of fat around an inflamed structure and is a very helpful signpost for intra-abdominal pathology.

What causes fat stranding around the kidney?

Stranding of the perinephric fat is a common finding, particularly among older patients. The stranding likely represents fluid that collects within the bridging septa of the perinephric fat as a result of increased lymphatic pressure.