The mass shows an echogenic central area with hypoechoic, surrounding soft tissue area. This is called the "target sign" and is typical of colonic malignancy.
Yet another sagittal ultrasound video clip shows the mass with the thickened sigmoid colon walls. Also note the absence of normal layered appearance of the normal large bowel.
This color Doppler ultrasound video shows the sigmoid colon mass to be poorly vascular. The mass has all the appearances of a sigmoid carcinoma.
See more ultrasound images and description of this case at:
http://www.ultrasound-images.com/colon.htm
http://emedicine.medscape.com/article/367061-imaging
The target sign are an indication of the mass originating from the sigmoid colon. The liver appeared normal. Very useful and informative blog for all of us.
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