Embedded organ sign

The embedded organ sign is used to help localize a mass and define the organ from which it originates. When a mass extrinsically compresses an adjacent organ (such as inferior cava vein and gastrointestinal tract)  it gives the organ a crescent shape, which is called a negative embedded organ sign. Conversely, if the organ appears to be embedded in the tumor (the positive embedded organ sign) is likely that the tumor originated from that organ.