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Doctor insights on: Can I Be Screened For Colon Cancer With A Ct Scan Instead Of A Colonoscopy

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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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Dr. Barry Rosen
4,342 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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Could I have a pet scan to check for colon cancer instead of having a colonoscopy?

Could I have a pet scan to check for colon cancer instead of having a colonoscopy?

I agree, No: Pet-ct scans are typically used after a diagnosis of cancer to look for other spread of the tumor. If you are looking for an alternative to routine colonoscopy, ct-colonography or virtual colonoscopy is an option. This still involves a bowel prep but requires no sedation. If something is found, you may still need a colonoscopy. Insurance companies are not quite on-board paying for this as yet. ...Read more

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I am required to have a pelvic CT scan once a year as follow-up to colorectal cancer treatment. Are double scans without and one with contrast needed?

I am required to have a pelvic CT scan once a year as follow-up to colorectal cancer treatment.  Are double scans without and one with contrast needed?

How long ago: Was your colon or rectal cancer? The protocol for doing with/without contrast (?Vascular and endoluminal?) may be evolving awy from the risk vs need for the without IV contrast. If it is 5 years since, and it was rectal cancer, i would stop scans. ...Read more

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I had a colon resection for colon cancer and now have a ostomy. I'm having problems and a barium enema shows filing of the cecum. What would cause thi?

I had a colon resection for colon cancer and now have a ostomy. I'm having problems and a barium enema shows filing of the cecum. What would cause thi?

I"m confused: If you have a colostomy, and barium is injected into it, the cecum (the first part of the colon in the rlq) should fill. Now, if the barium is injected into your rectal stump and the barium fills, then there's a tract (fistula) between the rectal stump and the cecum, which is not normal. This should be discussed with the operating surgeon. Good luck. ...Read more

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Can a doctor detect anal cancer through a colonoscopy and/or a sonogram of the prostate?

Can a doctor detect anal cancer through a colonoscopy and/or a sonogram of the prostate?

Anoscopy: A better method would be anoscopy. See this site for information. http://www.nlm.nih.gov/medlineplus/ency/article/003890.htm ...Read more

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I just had a colonoscopy and have been diagnosed with Sigmoid diverticular disease and the doctor also found a 3cms cytic/mucinous lesion in my colon?

I just had a colonoscopy and have been diagnosed with Sigmoid diverticular disease and the doctor also found a 3cms cytic/mucinous lesion in my colon?

Diverticulosis: Diverticuli are small pouches in your intestine. When stool gets stuck in there it can become painful - diverticulitis. The 3cm lesion needs to be biopsied for things such as cancer or pre cancer. Please see your doctor for more answers. ...Read more

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Why would I have to have a colonoscopy after being diagnosed with diverticulitis via CT scan?

Why would I have to have a colonoscopy after being diagnosed with diverticulitis via CT scan?

Possibly: It depends some on your age and past history. Diverticulitis, an infection of the colon, can sometimes show a lot of thickening on ct scan. That can be hard to tell if the infection caused the swelling, or if a tumor is causing the thickening. It is common to recommend a colonoscopy several weeks after the diverticulitis had healed, if you have not already had one. ...Read more

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Is a small ascending colon lesion near cecum the same as polyp? They want to do CT scan. I have no pain or family history of CC. Should I be worried?

Is a small ascending colon lesion near cecum the same as polyp?  They want to do CT scan. I have no pain or family history of CC. Should I be worried?

Probably okay.: It may be a polyp or some other abnormality which was seen. It is impossible to know until it is evaluated. Certainly it is important to follow through. Good luck. ...Read more

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When screening for small cell lung cancer how big does a mass seen on a CT should be considered for investigation or benign .

When screening for small cell lung cancer how big does a mass seen on a CT should be considered for investigation or benign .

THAT'S the question!: The smaller you make the cutoff, the more false-positives you get. Screening has led to a tremendous increase in cases found, but very little overall reduction in lung cancer mortality. Usually it's adenocarcinomas that we find, not small-cells. You decide what it all means. Best wishes. https://www.ncbi.nlm.nih.gov/pubmed/25326638 ...Read more

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What would a PET scan show that a CT scan may not for a person with pancreatic cancer?

What would a PET scan show that a CT scan may not for a person with pancreatic cancer?

PET in cancer: PET scans are used to detect areas of abnormally increased metabolism, while CT scans only detect areas of differing density or lucency to radiation. So an abnormality like an area of scarred old tumor might look abnormal on CT scan but not have increased metabolism indicating active cancer on PET scan. False positives still occur with both, but they tend to commplement each other. ...Read more

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Can bowel cancer be diagnosed through a barium enema and a colonoscopy? Help please?

Yes: Either or colonoscopy is the best tool accuracy more than 95% barium enema use to be the tool but the accuracy and false positive and negative are not enough to depend on colonoscopy can discover polyps too small to be seen by barium enema and can have it removed at the same time. ...Read more

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If someone had colon cancer a year ago how often should he get a colonoscopy and do all colon and rectal cancers starts from a polyp?

If someone had colon cancer a year ago how often should he get a colonoscopy and do all colon and rectal cancers starts from a polyp?

It depends, and yes: If the colon cancer was small, repeat colonoscopy should be done every year. If it was big or obstructed the colon, repeat colonoscopy might be necessary in 3 or 6 months. Ask your oncologist. And yes, all colon carcinomas are believed to start as polyps. ...Read more

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Had a colonoscopy done doctor found rectal mass 2to 3 CM from anal verge is it normal for him to request a CT scan for this?

Had a colonoscopy done doctor found rectal mass 2to 3 CM from anal verge is it normal for him to request a CT scan for this?

One imaging option..: Your doctor is looking to see if your mass extends outside the rectal wall. This information will determine what kind of treatment to offer (e.g. Type of surgery that's possible, and is radiation therapy appropriate). Best of luck to you. ...Read more

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Ct scan shows diverticulitis Gi advised sigmoidoscopy to check narrowing of colon could it be cancer as been told only scoping can confirm difference?

Ct scan shows diverticulitis Gi advised sigmoidoscopy to check narrowing of colon could it be cancer as been told only scoping can confirm difference?

Unfortunately those: two conditions can look similar on the CT scan. Another option is to treat for diverticulitis, then repeat the CT scan to see if the abnormality has resolved. If you don't have symptoms of diverticulitis, you should have the sigmoidoscopy. ...Read more

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I have had ulcerative colitis for 13 years. A recent colonoscopy showed a cancer tumor in the right side of colon. Should i go for a full or partial colon removal ?

I have had ulcerative colitis for 13 years. A recent colonoscopy showed a cancer tumor in the right side of colon. Should i go for a full or partial colon removal ?

Probably : Best is total colon removal because leaving diseased colon in place would keep you at future risk for more colon cancers in the future, and you would need frequent colonoscopy. Can get off colitis medications with surgery. Best to see a colon rectal surgery specialist, maybe at a university, who has extensive experience in ileo-anal pouch surgery. ...Read more

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If a pet scan showed a liver met and a node in October for a person with colon cancer , on chemo, can the january scan show further mets?

If a pet scan showed a liver met and a node in October for a person with colon cancer , on chemo, can the january scan show further mets?

Hopefully not: As with any cancer, progression of disease is always possible and the purpose of surveillance imaging is to assess for the effectiveness of the treatment. Hopefully, the next scans will show improvements and not additional mets as the chemotherapy impact has begun. ...Read more

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If i had a clear abdominal & pelvic CT scan with contrast because of blood on stool, am i safe in thinking that it is not colorectal cancer?

If i had a clear abdominal & pelvic CT scan with contrast because of blood on stool, am i safe in thinking that it is not colorectal cancer?

Not Yet: Your age and family history play a role in believing there is increased risk or not, but, the final test to be certain would be a colonoscopy. Most colon cancers will start as polyps, a small growth on the wall. These are not well seen on ct scans and can only be ruled out completely with a colonoscopy. ...Read more

Dr. Tanya Russo
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Computed Tomography (Definition)

Ct uses xrays taken an 360 degrees combined with a computer to see"inside" the body. The table moves as the xray tube and detectors spin around the patient 10 times a second or more! the image shows excellent soft tissue detail, enhanced with injection of intravenous contrast or oral contrast. This way the body is shown in slices, in any plane, usually axially, but ...Read more


Dr. Hamid Sajjadi
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