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Doctor insights on: Can An Abdominal Pelvic Cat Scan Screen For Colon Cancer Or See A Mass In The Rectum

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Can an abdominal pelvic cat scan screen for colon cancer or see a mass in the rectum?

Can an abdominal pelvic cat scan screen for colon cancer or see a mass in the rectum?

Sometimes: Sometimes a cat scan will be able to see a mass in the colon or rectum but it is not a good test for screening for colorectal cancer. There is a specialized type of ct scan that creates a virtual image of the inside of the colon that is sometimes used when a patient is not a good candidate for a colonoscopy. ...Read more

Dr. Barry Rosen
4,351 Doctors shared insights

Cancer (Definition)

Cancer is a group of diseases that is characterized by uncontrolled cell growth leading to invasion of surrounding tissues that spread to other parts of the body. Cancer can begin anywhere in the body and is usually related to one or more genetic mutations that allow normal cells to become malignant by interfering with internal cellular control mechanisms, such as programmed cell death or by preventing ...Read more


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Can a CT scan of the abdomen/pelvis without contrast detect colon cancer and ulcers?

Can a CT scan of the abdomen/pelvis without contrast detect colon cancer and ulcers?

CT Scan Findings: Ct scan is not the best study to detect colon cancer or ulcers. Although a ct scan may show a large sized colon cancer, the sensitivity of this is greatly reduced without the administration of oral contrast. Ulcers are typically not seen on ct scan. The best diagnostic study for both of these would be an endoscopy and colonoscopy. ...Read more

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On chemo for metastic colon cancer. Ct scan coming up - says Neck, thorax, abdomen and pelvis. Is neck usually scanned?

On chemo for metastic colon cancer. Ct scan coming up - says Neck, thorax, abdomen and pelvis. Is neck usually scanned?

Yes: There are multiple sites where metastatic colon cancer can appear. While the liver and lung are the most common visceral sites other than lymph nodes in abdomen, spread can occur to the left supraclavicular fossa. Troisier sign is the finding of a hard and enlarged left supraclavicular neck node (Virchow's node). It is a sign of metastatic abdominal malignancy draining the thoracic duct. ...Read more

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Can a CT with contrast of abdomen and pelvis detect colon cancer?

Can a CT with contrast of abdomen and pelvis detect colon cancer?

It can sometimes: Unfortunately, ct scans are not very good at finding small polyps like a colonoscopy does. The scan will usually only pick up larger lesions. The endoscopy has an additional benefit of allowing small polyps to be biopsied or removed. Polyps tend to grow to become cancer, so they should be removed if possible. Ct scan, won't allow treatment at same time, and thus, is not as good a test for colon ca. ...Read more

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If colon cancer was causing pain RUQ wouldn't it be big enough to show on CT of abdomen and pelvis? 31 yo- fecal occult blood negative

If colon cancer was causing pain RUQ wouldn't it be big enough to show on CT of abdomen and pelvis? 31 yo- fecal occult blood negative

Not likely colon Ca: Classic colon cancer causes pain via colon obstruction, so in that case, CT would see it. But this would not be expected in a 31 yo w/ occult neg stool.
RUQ pain can be any number of causes in young adult. Need to know more history and clinical exam by a Dr. To advise work up.
Best screen for colon Ca is colonoscopy, but unless strong family history, may start around 50 yrs old. ...Read more

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Would advanced colon cancer show up on a CT scan of my abdomen? Reg CT scan not virtual colonoscopy.

Would advanced colon cancer show up on a CT scan of my abdomen? Reg CT scan not virtual colonoscopy.

Imaging/biopsy: The imaging modality of ct scan could show findings that would be concerning for cancer, mass around your colon, enlarged lymph nodes in the same area. However, the diagnosis is made at biopsy, a piece of the mass under the microscope of a pathologist. Often the ct scan leads to the biopsy. Good luck, it is important to get the evaluation completed. ...Read more

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A friend has been told they have colon cancer, diagnosed via a tumour marker blood test, high cea, CT scan showed contained mass. Is this conclusive?

A friend has been told they have colon cancer, diagnosed via a tumour marker blood test, high cea, CT scan showed contained mass. Is this conclusive?

No, but...: But very suspicious for colon cancer. If your friend is similar in age to yourself a mass in the colon on ct scan is cancer until proven otherwise. And CEA levels can go up for other reasons but, given the mass, they would strongly favor cancer. But to answer your question "no"... They are not definitive. You would need a piece of the mass under a microscope to prove definitively its cancer. ...Read more

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Chance 4 ab / pelvic CT scans all missed symptomatic colon cancer (narrow stools, occaision blood) over three years. Also had sigmoidosopy to 35cm?

Chance 4 ab / pelvic CT scans all missed symptomatic colon cancer (narrow stools, occaision blood) over three years. Also had sigmoidosopy to 35cm?

Hematochexia: Negative sigmoidoscopy and CT sacn of pelvis and Abdomen. May need a full colonoscopy doubt colon cancer for 3 years without significant progression. Other cause like IBD more likely ...Read more

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Can I be screened for colon cancer with a CT scan instead of a colonoscopy?

Can I be screened for colon cancer with a CT scan instead of a colonoscopy?

Sometimes: Ct colography is never meant to replace a colonoscopy. At high volumn centers, the detection sensitivity of ct exam is indeed comparable to colonoscopy but you need to know the rate of detection of your imaging facility. Bowel prep is required for both procedures - no way around the unpleasant process. Beware that there is significant radiation exposure with the exam. ...Read more

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A recent CT scan with contrast revealed two cysts on pancreas. What does this mean? Previous colon cancer and has esld. Also 6mm mass on liver.

A recent CT scan with contrast revealed two cysts on pancreas. What does this mean? Previous colon cancer and has esld. Also 6mm mass on liver.

Needs attention: Needs work up. Most of the pancreatic tumors are solid but cysadenoma, cystadeno carcinoma will present as cystic lesions need biopsy of these lesions to make sure they are not malignant also liver lesion. If pancreatic lesions are benign could be a candidate for liver transplantation for end stage liver disease (esld). ...Read more

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I have lwr rt quad pn in abdomen and rt back flank. My back hurts most when laying down. I have a CT in 3 days. Fam hst of colon cancer dad & brot?

I have lwr rt quad pn in abdomen and rt back flank. My back hurts most when laying down. I have a CT in 3 days. Fam hst of colon cancer dad & brot?

Many possibilities.: Right lower quadrant pain with radiation to the flank can be many different things. Possibilities include appendix inflammation, constipation, kidney infection, kidney tumor, colon tumor, etc. The imaging study will be very helpful. If the imaging study is inconclusive consider having a colonoscopy to be complete. Good luck. ...Read more

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Can a CT on abdomen with contrast show colon cancer if there are present symtoms?

Can a CT on abdomen with contrast show colon cancer if there are present symtoms?

Not always: Unless the cancer lesion is fairly large, colon cancer is not commonly seen on a ct scan. Colonoscopy is the best test for colon cancer. Some places have the ability to perform a specialized ct colonography x-ray exam that may see lesions about 1 cm or larger. ...Read more

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Haven't had solid bowl movement more then 8 months pain & feel mass upper abdomen weight gain dad has colon cancer & aunt has stomach cancer worried?

Haven't had solid bowl movement more then 8 months pain & feel mass upper abdomen weight gain dad has colon cancer & aunt has stomach cancer worried?

Lots of issues...: You're describing many systemic concerns, but its impossible to tell here if your symptoms are all due to organic/metabolic disease or even related. Granted, your family history is notable, ; may indicate lynch syndrome. A thorough history ; physical with some simple investigatory lab studies ; x-rays would be a great place to start in getting the answers, reassurance ;/or treatment you need. ...Read more

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Would colon cancer or rectal cancer show up on an abdominal CAT scan?

Would colon cancer or rectal cancer show up on an abdominal CAT scan?

Potentially: It could show up on CT if large enough, but small tumors may not be visualized. ...Read more

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Why can't a CT scan see colon cancer well? How large would it need to be to be seen?

Why can't a CT scan see colon cancer well? How large would it need to be to be seen?

Not Designed for it: Not what a ct scan is designed to do.

Usually colon cancer will not be clearly evident on ct until it is at stage iii or stage IV level, since it has to anatomically change the colon to be evident on ct. To get that level of change, it needs to be at minimum a locally advanced tumor.

Every once in a while it may be evident at the stage ii point, but very low sensitivity. ...Read more

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Can a CT scan see stage 2 colon cancer?

Sometimes: Ct imaging can show abnormalities in the colon, but the best test is colonoscopy. This gives a doctor the chance to directly visualize the colon and also biopsy anything suspicious. ...Read more

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Would a cat scan a month ago show advanced colon cancer? Been having weakness weight loss last few weeks and I hear you don't get symptoms till advnc

Would a cat scan a month ago show advanced colon cancer? Been having weakness weight loss last few weeks and I hear you don't get symptoms till advnc

Depends: It depends on what you mean by advanced. If you mean spread to other organs, usually it will. If you mean advanced within the colon itself. Not unless it was really large. I've noticed that you seem to be asking a lot about colon cancer. If you have had a clear colonsocopy, you should be in the clear. ...Read more

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Is it true that colon cancer can take years before causing symptoms? So a cat scan I had just a month ago showing nothing could be good news?

Is it true that colon cancer can take years before causing symptoms? So a cat scan I had just a month ago showing nothing could be good news?

Yes...: Colon and rectal cancer is usually a slowly growing tumor in the colon or rectum. From its earliest beginnings as a colon polyp its estimated to take 10-15 years to grow into a cancer. A standard ct scan of the abdomen/pelvis is not a good or accurate test for early detection of colon cancer. Colonoscopy is the best test for early detection of polyps or cancer in the rectum and colon. ...Read more

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Can an ultra sound or a cat scan detect colon cancer?

Can an ultra sound or a cat scan detect colon cancer?

Other good tests: Early colon cancer is not easily visible on Ultrasound. CT scan is under trials to find out its utility. Right now the best test is Colonoscopy where it is easy to visuallise early colon cancer and precursor lesions. Ask your doctor in case you may need one done. It is recommended for all adults aged 50 years or earlier if there is a family history of colon cancer. Ask your doctor's advice. ...Read more

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Abdominal cat scan show colon cancer?

Abdominal cat scan show colon cancer?

Unreliable: Specialized cts that are designed to identify colon cancers (ct colonography) are available, but require a specific bowel prep and regimen to be effective. Routine ct scans will miss many small colon cancers that colonoscopy will find--colonoscopy remains the gold-standard. ...Read more

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Hlthy 38yo guy-A lot blood on TP after straining to poop-dark poop-slight red water-anus painful. AB CAT scan in Aug ok. % of chance of colon cancer?

Hlthy 38yo guy-A lot blood on TP after straining to poop-dark poop-slight red water-anus painful. AB CAT scan in Aug ok. % of chance of colon cancer?

Hemorrhoids: Blood in stool probably bright red due to internal fissure or hemorrhoids. With previous exam and neg CAT scan one suspects rectal exam was neg and a very strong possibility no relationship to a tumor found. Proctoscopy should be performed and if neg. Followed by colonoscopy to pinpoint nature of bleed. ...Read more

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Can you have symptomatic colon cancer for five years without showing on ct scans (oral no iv contrast)? Have had five ct in past 5 years

Can you have symptomatic colon cancer for five years without showing on ct scans (oral no iv contrast)? Have had five ct in past 5 years

Colon CA CT on show?: 41 F Asks: Can you have symptomatic colon cancer for five years without showing on ct scans (oral no iv contrast)? Have had five ct in past 5 years. ANS: CT not so good for colon cancer detection. What are symptoms for 5 years? This would be unusual as colon CA usually does not cause symptoms other than bleeding or obstruction. Unless it is also in liver now. That should show up on CT eventually. ...Read more

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How often should I have CT scan after colon cancer surgery for the first year?

How often should I have CT scan after colon cancer surgery for the first year?

Depends on stage: Depends on need for it, by clinical examination, blood tests, CEA levels, to detect metastasis pet scan is a much better tool. ...Read more

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How reliable is a ab CT scan for colon cancer? Had 3, what percentage of cancers are missed in a CT scan? Trying to find stats.

How reliable is a ab CT scan for colon cancer? Had 3, what percentage of cancers are missed in a CT scan? Trying to find stats.

Colon cancer: A ct scan is not the diagnostic modality of choice to find colon cancer. It may find late cancers that are causing symptoms but if you want to find colon cancer or precancerous polyps you need a colonoscopy. ...Read more

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Can a ct scan detect liver failure in metastic colon cancer?

Can a ct scan detect liver failure in metastic colon cancer?

No: A CAT scan is used to visually define the extent of metastatic colon cancer in the liver should metastasis be present. Liver failure is a condition measured by functional abnormalities that occur within the liver usually due to parenchymal damage such as inflammation from hepatitis. Here one measures serum enzymes and the presence of elevated alkaline phosphatase and bilirubin in serum. ...Read more

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Had surgery for colon cancer no chemo, after 4 months CT scan showed spot on liver. Could it be cancer?

Had surgery for colon cancer no chemo, after 4 months CT scan showed spot on liver. Could it be cancer?

Possible: Depending on what stage your colon cancer was originally the risk of developing disease in the liver or elsewhere is variable. Colon cancer, when it spreads through the blood, does commonly go to the liver, however if only a small area and a single or small couple of lesions it can still be cured. Additional tests may help to further characterize this to help u decide if u need to treat it ornot. ...Read more

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Ct scan showed spot on liver, have colon cancer but ultrasound came back negative does it mean it was wrong?

Pet or MRI may help: Other imaging modalities may help further clarify if this finding in ct is suspicious for malignancy or more likely benign if the ct and ultrasound have not been more specific. If u have older ct scans to compare and this is indeed new, then further clarification is needed. This all has to be taken into context of the bigger clinical picture including CEA as well as the rest of your body. ...Read more

Dr. Creighton Wright
1 Doctor shared a insight

Screening (Definition)

Examples are: colonoscopy for colon polyp or cancer; mammograms for breast lesions or cancer; psa a blood test that could indicate enlargement of cancerous prostate tissue; blood sugar or hemoglobin a! c for diabetes. Many think that scanning the whole body will pick up a cancer--in all likelihood, it will not. There also is no good blood test, yet, ...Read more


Dr. Lawrence Kessler
13 Doctors shared insights

Colon (Definition)

The colon is another term for the large intestine. This is the final portion of the digestive system, responsible for absorbing water and storing stool before evacuation. It is divided into sections described as cecum; ascending, transverse, descending and ...Read more