Bursa
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Written from published radiology references and reviewed for plain language. Not written or signed by a physician, and not a diagnosis. How we write these pages →
In plain language
A small fluid-filled cushion that reduces friction between tissues; when irritated it is called bursitis.
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Where you'll see this
This wording turns up on Shoulder MRI reports — MRI imaging of the shoulder. A shoulder MRI shows the rotator cuff muscles and tendons, the labrum (the cartilage rim of the socket), the biceps tendon, the joint surfaces, and the surrounding bones. Doctors order it for shoulder pain, weakness, limited movement, or after an injury. Some changes, like mild tendon wear, are common with age and may not fully explain symptoms — your doctor connects the images to your exam.
Questions worth asking your doctor
- Do the MRI findings explain the pain or weakness I feel?
- Is any finding likely age-related rather than from a recent injury?
- What are my options, including physical therapy and other non-surgical care?
- If there is a tear, does it need surgery or can it be managed conservatively?
- Do I need any follow-up, and when?
How common is this?
A bursa is a small fluid-filled sac that sits where tissues rub against each other — between a tendon and a bone, or under the skin over a bony point — and lets them glide. The body has many, and they are named on shoulder, hip, knee and elbow reports. The subacromial bursa in the shoulder is the one mentioned most often.
When should I worry?
A bursa with a little fluid in it is normal, and a small amount is frequently reported without any significance. Bursitis means the sac has become irritated and holds more fluid than usual, and it is common and generally settles. The description that matters is fluid alongside signs of infection — redness, heat, fever — which is a different and urgent situation requiring assessment rather than waiting. Otherwise bursal fluid usually accompanies whatever is irritating the area rather than being the primary problem.
What happens next
Most bursitis is managed conservatively: reducing whatever is aggravating it, physiotherapy, and pain relief. A steroid injection into a bursa is a common and reasonably effective option for persistent cases, and it is a lower-risk site for injection than a tendon. Where a bursa is inflamed because of an underlying problem such as tendinopathy or impingement, treating that is what prevents it returning.
Frequently asked questions
- Is bursal fluid abnormal?
- A small amount is normal — a bursa is a fluid-filled sac by design. Reports mention it when the amount is more than expected, which suggests irritation, and even then it is often a secondary finding rather than the main problem.
- What causes bursitis?
- Usually repetitive friction or pressure, or an underlying problem in the area such as tendinopathy or impingement. Less commonly it follows an injury, and rarely it is infective, which is a distinct and urgent situation.
- Can bursitis be injected?
- Yes, and a bursa is a comparatively safe place to inject steroid — unlike a tendon, where it can weaken the tissue. Injection is a common option for bursitis that has not settled with conservative treatment.
Other words on the same report
Where this word comes up
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