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Purpose/Terms of Use

RadiologyInfo™ is the public information website developed and funded by the Radiological Society of North America (RSNA) and the American College of Radiology (ACR). It was established to inform and educate the public about radiologic procedures and the role of radiologists in healthcare, and to improve communications between physicians and their patients.

RadiologyInfo is dedicated to being the trusted source of information for patients, families, and health care providers about the vital role of medical imaging, image-guided therapy, and radiation therapy in health care. To assure its quality and accuracy, each section has been created with the guidance of a physician with expertise in the topic presented. All website information is further reviewed by an RSNA-ACR committee comprised of physicians with expertise in several radiologic areas.

This website will be updated frequently and expanded to include new information. However, it is not possible to ensure that the website contains complete, up-to-date information on any particular subject. Therefore, RSNA and ACR make no representations or warranties about the suitability of this information for any particular use or purpose. All information is provided "as is" without express or implied warranty.

No medical advice or referrals: The information posted here by the RSNA and ACR should not be considered medical advice and is not intended to replace consultation with a qualified radiologist. RSNA and ACR will not answer specific medical questions or make referrals to a particular radiologic professional. Please see the Frequently Asked Questions (FAQ) page for other questions.

Comments: If you wish to submit comments, please use the form on the Contact Us page or use the Feedback area provided on each procedure description or article page. Comments may also be sent via e-mail to Due to the volume of messages we receive, we are unable to reply to all inquiries.

No literature or web searches: RSNA and ACR do not conduct searches of the medical literature or of information contained on the World Wide Web for persons accessing this site and requesting such searches.

Note about links: For the convenience of our users, RadiologyInfo provides links to relevant websites. RadiologyInfo, RSNA, and ACR are not responsible for the Web content found at these links.

This page was reviewed on May 01, 2023

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Please note is not a medical facility. Please contact your physician with specific medical questions or for a referral to a radiologist or other physician. To locate a medical imaging or radiation oncology provider in your community, you can search the ACR-accredited facilities database.

This website does not provide cost information. The costs for specific medical imaging tests, treatments and procedures may vary by geographic region. Discuss the fees associated with your prescribed procedure with your doctor, the medical facility staff and/or your insurance provider to get a better understanding of the possible charges you will incur.

Web page review process: This Web page is reviewed regularly by a physician with expertise in the medical area presented and is further reviewed by committees from the Radiological Society of North America (RSNA) and the American College of Radiology (ACR), comprising physicians with expertise in several radiologic areas.

Outside links: For the convenience of our users, provides links to relevant websites., RSNA and ACR are not responsible for the content contained on the web pages found at these links.