Definition
A cyst is a fluid-filled pocket. Simple cysts are usually benign; complex lesions need characterisation.
Symptoms
Usually symptom-free; occasionally pain, infection or bleeding.
How it may be discovered
Common incidental ultrasound or CT finding.
When to seek care
Have the report reviewed. Fever, severe pain or blood in urine needs prompt advice.
Investigations and tests
Ultrasound; appropriately selected CT or MRI for complex appearances.
Reaching a diagnosis
Morphology, including the Bosniak classification when applicable, guides risk assessment.
Treatment options
An uncomplicated symptom-free simple cyst often needs no treatment; other lesions may need monitoring or intervention.
These kidney guides are educational. Medical kidney disease may require coordinated care with a nephrologist.
Explore this topic further
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