Baker's Cyst Diagnosis

How will your doctor diagnose you with this condition? Learn about the tests, exams, processes, and other information relating to the diagnosis of Baker's Cyst below.

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How to Diagnose Baker's Cyst


Your doctor will ask about your symptoms and medical history. During a physical exam, the doctor will look for a soft mass in the back of the knee, and compare range of motion (and limitations) of the affected knee to the normal knee. The following tests or procedures may be done:

  • Trans-illumination-shining a light through the cyst to show the mass is fluid-filled.
  • Ultrasound and CT scans -tests useful in sorting out other causes of knee swelling.
  • MRI scan -a test that uses magnetic waves to make pictures of structures inside the body. This can be helpful to visualize the cyst and show any meniscal injury.
  • X-rays (arthrography) may be taken. A Baker's cyst will not appear on X-rays but they can show arthritis or other knee abnormalities.

If the cyst is growing rapidly and accompanied by fever, blood samples may be taken to rule out more serious tumors that could occur behind the knee.


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Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition. Copyright ©2013 EBSCO Publishing All rights reserved. Source: EBSCO