Colorectal cancer ultrasound

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To view the ultrasound of familial adenomatous polyposis (FAP), click here
To view the ultrasound of hereditary nonpolyposis colorectal cancer (HNPCC), click here

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Saarah T. Alkhairy, M.D.

Overview

Abdominal ultrasound can be used to look for tumors in the liver, gallbladder, pancreas, or elsewhere in your abdomen, but it can't look for colorectal cancer. The two special types of ultrasound exams that can be performed to evaluate colon and rectal cancers are endorectal ultrasound and intraoperative ultrasound.

Ultrasound

Abdominal ultrasound can be used to look for tumors in the liver, gallbladder, pancreas, or elsewhere in your abdomen, but it can't look for colorectal cancer. Findings on an ultrasound include:

• Abdominal mass
• Intra-abdominal bleeding
• Peritoneal metastasis
• Hepatic metastasis

Two special types of ultrasound exams can be performed to evaluate colon and rectal cancers.

Endorectal ultrasound This test uses a special transducer that is inserted directly into the rectum. It is used to see how far through the rectal wall a cancer may have penetrated and whether it has spread to nearby organs or tissues such as lymph nodes.

Intraoperative ultrasound

This exam is done during surgery after the abdominal cavity has been opened. The transducer can be placed against the surface of the liver, making this test very useful for detecting the spread of colorectal cancer to the liver.

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