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Odds of 4 cm Mildly Complex Kidney Cyst Being Cancer

2015-06-10 08:41

Odds of 4 cm Mildly Complex Kidney Cyst Being CancerA complex kidney cyst show calcification and has the risk of being cancerous. You want to know the odds of 4 cm mildly complex kidney cyst being cancer, read this article carefully.

A system to predict a risk of cancer of complex kidney cyst

The Bosniak classification system of renal cystic masses divides renal cystic masses into five categories based on imaging characteristics on contrast-enhanced CT. It is helpful in predicting a risk of malignancy and suggesting either follow up or treatment.


● Bosniak 1

-simple cyst, imperceptible wall, rounded

-work-up: nil

-percentage malignant: ~0%

● Bosniak 2

-minimally complex, a few thin (<1 mm) septa, thin calcifications; non-enhancing high-attenuation (due to to proteinaceous or haemorrhagic fluid) renal lesions of less than 3 cm are also included in this category; these lesions are generally well marginated

-work-up: nil

percentage malignant: ~0%

● Bosniak 2F

-minimally complex but requiring follow-up

-increased number of septa, minimally thickened or enhancing septa or wall

-thick calcifications

-hyperdense cyst, i.e. >3 cm diameter, mostly intrarenal (less than 25% of wall visible); no enhancement

-work-up: needs ultrasound/CT follow up - no strict rules on the time frame but could do at around 6 months.

-percentage malignant: ~ 5%

● Bosniak 3

-indeterminate, thick or multiple septations, septal nodularity, hyperdense on CT

-treatment/work-up: partial nephrectomy or radiofrequency ablation in elderly or poor surgical candidates

-percentage malignant: ~54%

● Bosniak 4

-clearly malignant, solid mass with a large cystic or a necrotic component

-treatment: partial or total nephrectomy

-percentage malignant: ~100%

Have you noticed this kind of description of the complex kidney cyst in your ultrasound or CT scan test report? You can send the report to us at or leave a message below.

Whether the 4 cm kidney cyst is cancerous or not, it is large enough to cause symptoms. It is likely to cause impaired kidney function. Patients need timely and natural treatment to shrink kidney cyst as well improve renal function. We are glad to give you some suggestions for free.

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