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Doctor insights on: Pet Scan Vs Ct Scan For Prostate Cancer

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Dr. Barry Rosen
4,318 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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I have stage 2b prostate cancer and a small low dense lesiion was found in the dome of my liver during ct scan with contrast. Could this mean Metases?

I have stage 2b prostate cancer and a small low dense lesiion was found in the dome of my liver during ct scan with contrast. Could this mean Metases?

Slight possibility: A metastasis to the liver in your situation is very unlikely. However, "Never say always or never". It should be followed up with other studies to make sure it is not a metastasis. There is also the possibility that it is caused by a condition other than the prostate cancer. Have you been treated for the primary prostate cancer? ...Read more

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What does a pet scan of my esophageal cancer show that a CT scan doesn't?

What does a pet scan of my esophageal cancer show that a CT scan doesn't?

Metastasis: A pet scan is helpful in identifying metastasis of the cancer, or spread to other organs such as the liver or bone, as well as spread to adjacent or distant lymph nodes. Abnormal images on the pet scan will glow with metabolic activity. ...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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How often do you need to use PET scan or bronchoscope to locate lung cancer because it does not show on CT scan but symptoms tell you to keep looking?

How often do you need to use PET scan or bronchoscope to locate lung cancer because it does not show on CT scan but symptoms tell you to keep looking?

Clinical judgement: This pathologist is underwhelmed with the health or public benefits of intensive screening for tiny lung cancers. I'd hope that if the person is symptomatic, some other investigations are undertaken and the actual cause gets found. ...Read more

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Prostate cancer, scheduled for rp, biopsies/6 of 8 positive 2aggressive w/ gleason of 7, CT & bone scan clear, male 55, healthy active. Prognosis?

Prostate cancer, scheduled for rp, biopsies/6 of 8 positive 2aggressive w/ gleason of 7, CT & bone scan clear, male 55, healthy active. Prognosis?

Gleason 7: Not all gleason 7 prostate cancer is the same. If the component of pattern 4 is low, some cancers are not much more aggressive than gleason 6 and have a great prognosis. If the percentage of pattern 4 is very high, the risk increases. ...Read more

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Male 55 healthy/active prostate cancer, scheduled for rp, psa 6.5 biopsies 6of8 pos 2aggessive, gleason 7. Are there other options to consider other than surg. Ct and bone scan clear. ?

Male 55 healthy/active prostate cancer, scheduled for rp, psa 6.5 biopsies 6of8 pos 2aggessive, gleason 7. Are there other options to consider other than surg. Ct and bone scan clear. ?

Yes but: Alternatives are external beam radiation and radiation seeds (brachytherapy). At your age, conservative (watching) isn't advised. All of the therapies can cause urinary incontinence and e.D. - with surgery, they get better over time for most. With radiation, they get worse over time. Surgery is the time honored best of a bad situation. Good luck. ...Read more

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My husband has prostate cancer that has metastasized to his pelvic nodes. His recent CT with contrast suggested a 17mm sclerotic focus in the posteri?

My husband has prostate cancer that has metastasized to his pelvic nodes.  His recent CT with contrast suggested a 17mm sclerotic focus in the posteri?

Your question is: incomplete...the "sclerotic focus" may suggest bone spread of the prostate Cancer. There is specific life extending treatment for this cancer and you should be discussing the alternatives witha Board Certified ONCOLOGIST Hope this helps Good Luck! Dr Z ...Read more

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How long can a prostate bleed while being flushed with saline bags. Cancer has been ruled out by a CT scan. It has been 3 weeks and my dad is worried.

How long can a prostate bleed while being flushed with saline bags. Cancer has been ruled out by a CT scan. It has been 3 weeks and my dad is worried.

Here are some ...: First, ask and work with professionals for detail and expectation. But, for the elderly, he may need some intervention to control bleeding and ensure bladder emptying and no UTI. Oftentimes, he may need surgical relieving prostate obstruction, preferably with laser because of its effectiveness and less bleeding. Ask Doc for individual detail. ...Read more

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A CT did not show the presence of cancer but a PET scan with contrast did. Why is this when they were looking for cancer within the pancreas?

A CT did not show the presence of cancer but a PET scan with contrast did. Why is this when they were looking for cancer within the pancreas?

Complementary: CT and PET are complementary and are usually used in conjunction with each other. Not uncommonly, a finding on a CT or on a PET will not be seen on the other study. Sometimes, I am asked to biopsy something only seen on PET that I have to guesstimate on the CT scan - using anatomic landmarks - because it is not visible on the CT. That's the challenge of imaging and why your radiologist is valuable ...Read more

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What is better X-ray to find liver cancer CT or pet scan or some other?

What is better X-ray to find liver cancer CT or pet scan or some other?

Depends: For primary liver cancer , i would recommend ct or mr . For metastatic disease , especially a GI cancer, i would start with pet/ct. ...Read more

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After chemo and/or radiation a person with cancer will never know if he/she is cancer free since ct's/pet scans will not show just a few cells?

After chemo and/or radiation a person with cancer will never know if he/she is cancer free since ct's/pet scans will not show just a few cells?

That is correct: The limitation of our technology is down to about 1 mm. sized lesions when applying MRI technology. CT technology can see only down to about 1 cm. in diameter of a lesioned area. The problem is that it only really takes 1 viable and HEALTHY CANCER CELL to get the whole process of recrudescence started again. Therefore, being "CANCER FREE", is something that can be said but never proven. ...Read more

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How much radio activity causes cancer bc I have had several ct, scans MRI eegs pet scans a EKG and a heart echogram plus 3 brain resections?

How much radio activity causes cancer bc I have had several ct, scans MRI eegs pet scans a EKG and a heart echogram plus 3 brain resections?

Alot: Not enough space for the best answer, but this same question was asked a year or so ago on the web, and the best answer can be found at the following link: http://answers.Yahoo.Com/question/index?Qid=20120922043341aa2koio ...And do not forget, mri's, eegs, ultrasounds, and ekg's have no radiation. ...Read more

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How do a pet scan and a CT scan differ?

How do a pet scan and a CT scan  differ?

Anatomic/physiologic: Pet scan involves intravenous injection of radio tracer usually f18 fdg.Imaging of whole body occurs for localization of areas of increased glucose metabolism. Malignant tumors usually most active.Ct scan involves x-ray and performs anatomic imaging of parts of body usually head, chest, abdomen, pelvis, or extremities. Pet?Ct combines imaging modalities for anatomic localization of areas of uptake. ...Read more

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Will a CT scan show the same kind of things as a pet scan when its concerning a lung?

Will a CT scan show the same kind of things as a pet scan when its concerning a lung?

Not the same: Ct scan will tell you the anatomy -whether there is a mass, nodule, lymph nodes, scars etc. Pet scan will tell you about the function /metabolism of the cells. Cancer cells have rapid turnover time thus it would uptake more sugar -resulting in " glowing" on the pet scan on the area with increased metabolism-like in cancerous area, or infection. Adding pet to ct scan will give more information. ...Read more

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What is the difference between a pet scan & a CT scan?

What is the difference between a pet scan & a CT scan?

Metabolism & Anatomy: A pet scan is use to evaluate metabolic processes in your body. Currently pet scans are most commonly use to evaluate the glucose metabolism to assess the activity of neoplasms by capturing gamma photons . For this purpose a radioactive form of sugar is injected in the patient. In ct scans external x-rays are use to produce an anatomic image of the body to evaluate size, shape, etc. ...Read more

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Dr. Guido Davidzon
291 doctors shared insights

Pet Scan (Definition)

Pet scans most often use a radioactive form of glucose, the energy source for most of the cells in our bodies. The pet scanner can detect and measure how much of the radioactive glucose analog, f-18 fdg, is in a particular organ or region. The areas using more glucose are hyper metabolic and generally more worrisome. Our brains and sometimes hearts prefer glucose as food, making ...Read more


Dr. Cornelius O'leary jr
1 doctor shared a insight

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