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Doctor insights on: Can Ct Scans Miss Glioblastoma

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Dr. Cornelius O'leary jr
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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


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Can 2 CT scans with contrasr miss anything wrong in the GI tract?

Can 2 CT scans with contrasr miss anything wrong in the GI tract?

Yes: There can be structural, infectious and metabolic problems within the intestine and liver that are missed by ct scans. Blood work, physical examination, dietary changes, and stool cultures will determine if direct visualization by scope is necessary. ...Read more

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Do ct scans with no contrast always miss tumors in the cerebellum?

Do ct scans with no contrast always miss tumors in the cerebellum?

Not always: Brain CT scans without contrast do not always miss cerebellar tumors. A tumor whose density is different from that of its adjacent brain tissue, or whose size is such that it pushes away adjacent brain tissue (distorting the normal shapes and outlines) will likely be visible even on noncontrast scans. ...Read more

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How high would chances be that symptomatic colon or rectal cancer be missed on 3 separate CT scans? Would this be very likely?

How high would chances be that symptomatic colon or rectal cancer be missed on 3 separate CT scans? Would this be very likely?

Possible to miss: The colon has many folds and turns with stool inside it. It would have to be big enough for a ct scan to show it and contrast inside the colon might help identify it on a ct scan. But it can miss a lesion. The best way to see colon cancer is taking a prep to clean out the colon and getting an endoscopy (colonoscopy) that can visualize the cancer and biopsy it at the same time. ...Read more

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Can 2 CT scans with contrast miss anything wrong in the abdomen and pelvis?

Yes: Every test has limitations. The ct scans may not have found the problem, but they have likely eliminated some possibilities. If you have had 2 ct scans and the symptoms persist, follow up with you doctor to determine if any other tests are needed. ...Read more

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How is it possible for CT scans to miss kidney stones? I continue to pass fragments but only have stones IN my kidneys according to my CT scan in June

CT: CT scans don't miss stones even stones that ultrasound or X-ray miss the ct picks the up. Patients can often pass "gravel" like and not have formed stones and this is not unusual. Often you can have passed a stone and get the ct and thus the scan is negative. The key in stones is prevention and urine metabolic work up is needed. Contact a kidney doc. Best of luck ...Read more

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Chance that 4 CT scans over 2 1/2 years would all miss sympotomatic colon cancer (narrow stool, occasion blood), also sigmoidscope to 35 cm.

Chance that 4 CT scans over 2 1/2 years would all miss sympotomatic colon cancer (narrow stool, occasion blood), also sigmoidscope to 35 cm.

Fairly high risk: CT scans are NOT good tools for looking inside the bowel. Endoscopy is the preferred tool, but a sigmoidoscopy, at its best, misses looking at half the colon. A look to merely 35 cm has missed about 85-90% of the colon. The usual method to evaluate the colon is a complete colonoscopy. ...Read more

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Would symptomatic colon cancer be missed on 3 separate CT scans? I am only 37 but have had narrow stools and small amounts of blood for past year.

Unlikely: Best test would be a colonoscopy for your symptoms or at least a sigmoidoscopy. Usually if a colon cancer had symptoms a year ago those symptoms would have progressed over the ensuing 12 months and by now it would have been obvious by your symptoms and ct scan. ...Read more

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Bowel issues 3 years, 4 Ct scans over that time with oral contrast, sigmoidoscopy to 35 cm, only diverticulosis seen, chances of missed cancer?

Bowel issues 3 years, 4 Ct scans over that time with oral contrast, sigmoidoscopy to 35 cm, only diverticulosis seen, chances of missed cancer?

Slim: In spite of the low chance of missing a cancer, a complete colonoscopy would examine the rest of the colon not visualized on sigmoidoscopy. CT is only fair to see colon cancers unless large because stool may get in the way. If you are still concerned then talking to your doctor may resolve these issues. ...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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Ct scans good for catching brain tumors? I did a CT scan several months ago because I was having head and neck pain. The CT scan turned out to be normal, but the head and neck pain have returned. I was wondering what the odds are that the CT scan missed

They aregood: Mri are better more sensitive as are ct with contrast or pet enhanced plain ct 83% sensitive congrats on normal ct. This should reassure you along with symptoms which come and go symptoms that go most neck pain is muscular and stress related with associated headaches common tension symptoms brain tumor is far down on the list when you hear hoof beats they are probably not zebras. ...Read more

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What are the chances an ultrasound, Mri/mrcp, ercp, and ct scans or imaging miss advanced liver cancer?

What are the chances an ultrasound, Mri/mrcp, ercp, and ct scans or imaging miss advanced liver cancer?

If it is tailored: For liver mass, and technically adequate (i.e. no artifacts that might obscure anatomy), it would be nearly impossible to miss a large liver tumor. ...Read more

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I have to go for a eus test tommorow I was just courois if the eus test would pick up something that cat scan or MRI would miss?

I have to go for a eus test tommorow I was just courois if the eus test would pick up something that cat scan or MRI would miss?

Yes: The endoscopic ultrasound is capable of visualizing small lesions which might not be apparent on ct or mri. This is because the probe is brought right next to the area of interest and higher frequency probes can be used which provide higher resolution than can be obtained with trans-abdominal scanning. ...Read more

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In march I started getting short of breath had xray EKG cat scan ultra sound of heart now I have all symptoms of heart failure could they missed it?

In march I started getting short of breath had xray EKG cat scan ultra sound of heart now I have all symptoms of heart failure could they missed it?

Heart failure.: Heart failure usually occurs slowly but can be precipitous. Understanding what the etiology causing the failure helps to understand best routes to evaluate and teat it. Your heart failure could be easily missed especially at your age. Talk to your doctors to understand what happened in your case. Physicians practice to help patients and to ensure they understand what is going on. ...Read more

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Why is it that people get burned from CT scans?

They typically don't: That would be an extremely rare occurrence requiring equipment breakdown and operator error at multiple levels. ...Read more

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Do CT scans detect glaucoma?

Do CT scans detect glaucoma?

No: Ct scans don't diagnose glaucoma. Ophthalmologists do. ...Read more

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What cancers do CT scans cause?

What cancers do CT scans cause?

They don't: Hey Matt! This is a good question and I'm glad to reassure you. A typical CT scan delivers maybe 3mSv, the same as the extra radiation a pilot gets each year. Pilot dose is cumulative and nobody has shown increased cancer in pilots. Up to 20 mSV/year is okay for radiation workers and they don't get extra cancer either. Relax and give yourself a break from worrying. ...Read more

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4 ct scans in 5 months? Too much radiation?

4 ct scans in 5 months? Too much radiation?

The decision: To use diagnostic X-rays is a risk/benefit analysis. The theoretical risk of a CT scan is very low. If the CT scans were medically indicated, it wasn't too much radiation. If the CT scans were unnecessary, then it was. You can go to xrayrisk. Com and calculate your theoretical increased cancer risk from the scans. ...Read more

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Are CT Scans accurate at discovering cancer?

Are CT Scans accurate at discovering cancer?

So-so: It depends where, how big the cancer is, and so forth. The new CT scans pick up lung cancers that are quite small -- most of the "cures" of tumors found this way may be of non-aggressive tumors. A scan can pick up a mass suspicious for cancer but of course tissue's required for certainty. ...Read more

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Do CT scans examine both the chest and head?

Do CT scans examine both the chest and head?

CT: CT (Computed tomography) can examine any anatomical part of the body. It does use ionizing radiation to acquire imaging so typically only the necessary part of the body in question is imaged. So a CT chest would be performed separately from a CT of the brain. Indications would depend on your symptoms and what your doc is looking for. Always discuss your concerns with your doc and radiologist. ...Read more

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Do regular CT scans show unruptured aneurysms?

Do regular CT scans show unruptured aneurysms?

CT scan: It depends what do you call a regular ct scan but usually IV contrast dye is needed to visualize the aneurysm. There are non contrast exams and others where IV contrast is employed. Where is the aneurysm located? . If it's large and calcified and perhaps located in the abdomen or chest it can be suggested by the non contrast ct. An ultrasound can detect readily in the abdominal aorta. ...Read more

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Can you please tell me how MRI and CT scans differ?

Can you please tell me how MRI and CT scans differ?

Radiation: The links that dr. Janjua listed are excellent. But the simple answer to your question is: ct scans depend on radiation to generate their images. Mri scans use magnetic waves to activate the protons which then give off characteristic signals that produce the images. The bottom line-no radiation with mris. Mris are better for soft tissue differentiations (ie. Brain tumors), ct are better for bone. ...Read more

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Can a tech get cancer from doing full body CT scans?

No: During ct scans radiology technician stays out side the scanner room, protected by lead lined shields. So many protective measures are in place, no one will be exposed to radiation, (except patient who will get the predicted amount of radiation). All the persons involved will wear special radiation exposure badges to be measured annually the total amount radiation. Exposure to that person. ...Read more

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Why wouldn't you use CT scans to detect cancer in everyone?

Why wouldn't you use CT scans to detect cancer in everyone?

What you are looking: Every radiology test like ct mri, angiograms, radio isotope scans, sonograms, pet scans, sonograms etc has a specific indication. All cancers cannot be detected by ct alone, for scattered small deposits of tumor (metastatic) pet scan is used, some of the bone tumors MRI is better, costs risks& benefits to be considered finally physiology and physics of tumor decides which is needed. ...Read more

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Do I have to see a specialist to get a CT or cat scan ordered?

No: No. Any licensed physician can order a ct or cat scan. Nurse practitioners and physician assistants can order them too. ...Read more

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Will the CT contrast from multiple CT scans start to affect my kidneys?

No.: The nephrotoxic effect of contrast is dose related, and does not accumulate over time. Multiple CTs would only make a difference if you had them within a very short time frame, for example if you had several contrast enhanced scans on the same day or over the course of a few days. ...Read more

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I have had 2 CT scans done in the past 4 years, what are my risks from that radiation?

Dependingscans done: Scans vary and some scan are very high dose and large volume. Others are small and of low volume.

See this site:


http://www. Xrayrisk. Com/calculator/calculator. Php


good luck. ...Read more

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I've had two nuclear stress tests and 5 ct scans in the last 10 years or so. Have I doomed myself?

NO: However you have absorbed a lot of radiation. I suggest avoiding any other evaluations and also get a comprehensive physical exam to understand why so many tests. You are not doomed. You are over-tested. ...Read more

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I had to have a few CT scans over the past several months. My dr said today these scans have put me at risk for cancer?

Risk & Benefit: Cts like other procedures have a risk benefit ratio and in almost all cases ct is worth the risk. There is risk from any radiation. See this site for more info and discuss the matter with your doctor.
http://www.cancer.gov/cancertopics/factsheet/detection/ct. ...Read more

Dr. Jefferson Chen
90 Doctors shared insights

Glioblastoma (Definition)

The unnatural, uninhibited overgrowth of certain supportive cells in the brain (not ...Read more