Colorectal cancer other imaging findings: Difference between revisions
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* CT colonography replaces X-ray films in the double contrast [[barium enema]] with a special [[computed tomography]] scan and requires special workstation software in order for the [[radiologist]] to interpret. | * CT colonography replaces X-ray films in the double contrast [[barium enema]] with a special [[computed tomography]] scan and requires special workstation software in order for the [[radiologist]] to interpret. | ||
* This technique is approaching [[colonoscopy]] in sensitivity for [[polyps]]. | * This technique is approaching [[colonoscopy]] in sensitivity for [[polyps]]. | ||
* However, any [[polyps]] found must still be removed by standard [[colonoscopy]]. | * However, any [[polyps]] found must still be removed by standard [[colonoscopy]].<ref name="pmid14657435">{{cite journal| author=Morrin MM, LaMont JT| title=Screening virtual colonoscopy--ready for prime time? | journal=N Engl J Med | year= 2003 | volume= 349 | issue= 23 | pages= 2261-4 | pmid=14657435 | doi=10.1056/NEJMe038181 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=14657435 }}</ref> | ||
===PET scan=== | ===PET scan=== |
Latest revision as of 20:42, 28 January 2019
Colorectal cancer Microchapters |
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To view the other imaging findings of familial adenomatous polyposis (FAP), click here
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Saarah T. Alkhairy, M.D.
Overview
Other imaging tests that can be used for colorectal cancer are endoscopy, PET scan, barium study, and angiography.
Other Imaging Findings
Virtual colonoscopy
- It is also known as CT colonography.
- CT colonography replaces X-ray films in the double contrast barium enema with a special computed tomography scan and requires special workstation software in order for the radiologist to interpret.
- This technique is approaching colonoscopy in sensitivity for polyps.
- However, any polyps found must still be removed by standard colonoscopy.[1]
PET scan
- Cancer cells in the body grow rapidly, so they absorb the radioactive sugar fluorodeoxyglucose or FDG used in positron emission tomography (PET).
- The location and extent of the tumor mass can be determined using a PET scan.
- Also, metastatic lesions and their locations can be assessed using a PET scan.
- PET scans are evolving as a very useful modality for staging and assessment of colorectal cancers.
- PET-CT scan has the advantage tissue based resolution and is useful in detecting whole body metastasis.
Barium Study
- First, an overnight preparation is taken to cleanse the colon.
- An enema containing barium sulfate is administered, then air is insufflated into the colon, distending it.
- The result is a thin layer of barium over the inner lining of the colon which is visible on X-ray films.
- A cancer or a precancerous polyp can be detected this way.
- This technique can miss the (less common) flat polyp. Barium study can be used to delineate the lesion preoperatively.
References
- ↑ Morrin MM, LaMont JT (2003). "Screening virtual colonoscopy--ready for prime time?". N Engl J Med. 349 (23): 2261–4. doi:10.1056/NEJMe038181. PMID 14657435.