Kidney cysts are fluid-filled sacs that form in the kidneys. Many are simple and harmless, while others, such as those in polycystic kidney disease, can affect kidney function over time. Dr. Satarupa Deb evaluates and manages cystic kidney disease at Bombay Hospital, South Mumbai.
What Is Cystic Kidney Disease?
Cystic kidney disease is a broad term for conditions in which cysts develop in the kidneys. The most common finding is a simple kidney cyst, which is usually discovered by chance on an ultrasound and rarely causes problems.
Autosomal dominant polycystic kidney disease (ADPKD) is an inherited condition in which many cysts grow in both kidneys, gradually enlarging them and reducing function. It is one of the more common inherited kidney diseases and often runs in families.
Types and Causes
Different kinds of kidney cysts have different causes and outlook:
- Simple kidney cysts, which become more common with age
- Autosomal dominant polycystic kidney disease (ADPKD), passed from a parent
- Autosomal recessive polycystic kidney disease, a rare condition usually seen in infants and children
- Acquired cystic kidney disease in people with long-standing kidney failure or on dialysis
- Complex cysts, which may need closer imaging to rule out other conditions
- Other inherited syndromes such as tuberous sclerosis
Symptoms
Simple cysts usually cause no symptoms. In polycystic kidney disease, symptoms often appear in adulthood and may include:
- High blood pressure, often at a young age
- Pain or heaviness in the back, side or abdomen
- Blood in the urine
- Kidney stones or urinary infections
- A gradual rise in creatinine over years
- Cysts in other organs such as the liver
Diagnosis
Imaging is the main tool for diagnosing and assessing kidney cysts.
- Kidney ultrasound, often the first test
- CT or MRI to characterise complex cysts or measure total kidney volume in ADPKD
- Blood creatinine, eGFR and urine tests
- Blood pressure assessment
- Family history and, in selected cases, genetic testing
Treatment and Management
Simple cysts usually need no treatment, though large cysts causing pain may occasionally be drained. Complex cysts may be monitored with repeat imaging or referred to a urologist.
In polycystic kidney disease, care aims to protect kidney function and prevent complications. This includes strict blood pressure control, a lower-salt diet, drinking adequate water unless advised otherwise, treating infections and stones promptly, and avoiding kidney-harmful painkillers. In selected adults at risk of rapid progression, a specific medicine (tolvaptan) may be considered under specialist supervision. If kidney failure develops, dialysis or transplant can be planned in advance.
People with polycystic kidney disease benefit from long-term follow-up, even when kidney function is normal. Regular monitoring of blood pressure, kidney function and urine allows problems to be spotted early. Family members may also be offered screening after discussion of its benefits and implications.
When to See a Nephrologist
Consult a nephrologist if an ultrasound shows multiple kidney cysts, if you have a family history of polycystic kidney disease, or if cysts are found alongside high blood pressure, blood in the urine or reduced kidney function.
Frequently Asked Questions
Is a simple kidney cyst dangerous?
Simple kidney cysts are very common, especially after the age of 50, and are almost always harmless. Most need no treatment or follow-up unless they cause symptoms or look complex on imaging.
Will my children inherit polycystic kidney disease?
In ADPKD, each child of an affected parent has a 50 percent chance of inheriting the gene. Screening and genetic counselling can be discussed with your nephrologist.
Can kidney cysts turn into cancer?
Simple cysts do not turn into cancer. Some complex cysts carry a small risk and are graded on CT or MRI to decide whether monitoring or further treatment is needed.
Does polycystic kidney disease always lead to dialysis?
Not always. The rate of progression varies widely between individuals. Good blood pressure control and regular monitoring may help preserve kidney function for longer.
Consult Dr. Satarupa Deb
If cysts have been found in your kidneys or polycystic kidney disease runs in your family, book a consultation with Dr. Satarupa Deb at Bombay Hospital, South Mumbai.
This page is for general information only and is not a substitute for a medical consultation. Please consult a qualified doctor for diagnosis and treatment.