Nephroureterolithiasis - Symptoms, Diagnosis, and Treatment

What Is Nephrolithiasis?

Nephrolithiasis is a common condition in which stones are found in the kidney. This can result in great pain and further distress. The stones may be of variable size and can block the urinary tract, thereby increasing the pressure in the kidney and causing a condition known as colic. However, some of the factors that contribute to kidney stones include heredity, high animal protein, salt and sugar diet, low water intake, gout, hyperparathyroidism, and inflammatory bowel diseases.

Treatment depends on the location of the kidney stone, its size, and the patient's symptoms. For example, small stones may sometimes pass independently with increased fluid intake and pain management. In other cases, treatment may involve medications to help break up the stones, or in severe cases, surgical intervention may be necessary to remove the stones.

What Is Nephroureterolithiasis?

Nephroureterolithiasis is a condition in which stones form in the kidney and then travel down the ureter, lodged there and blocking the urinary tract. These stones are formed through an unequal proportion of some substances in the urine, including calcium, oxalate, and uric acid. When these substances are concentrated in large amounts, it is possible to see that they turn into solid substances in their pure form, with a structure similar to rice grains up to large stones of several centimeters. The ureter carries urine from the kidneys to the bladder, and when a stone becomes lodged in the ureter, it can cause pain, discomfort, and difficulty urinating. Nephroureterolithiasis can occur due to kidney stones, in which the stone formed travels down the ureter, or it can occur independently, with the formation of stones in both the kidney and the ureter.

What Are the Types of Nephroureterolithiasis?

• Calcium Stones - These are the most common type of nephroureterolithiasis and can be caused by high levels of calcium in the urine or by imbalances in other substances that regulate calcium levels in the urine.

• Uric Acid Stones - Increased uric acid in the urine results in the formation of uric acid stones. It can be related to a diet high in purines or certain medical conditions.

• Struvite Stones - These stones form after a urinary tract infection and are composed of magnesium ammonium phosphate and calcium carbon apatite.

• Cystine Stones - Cystine stones form due to the genetic disorder cystinuria, which causes the amino acid cystine to leak out of the kidneys into the urine.

What Are the Symptoms of Nephroureterolithiasis?

• The symptoms of nephroureterolithiasis can be severe and significantly impact a person's quality of life.

• A blocked stone in the ureter can cause blockage of the urinary tract and result in symptoms such as severe pain below the ribs, in the side and back, radiating to the lower abdomen and groin, and waves of fluctuating intensity.

• Other symptoms can include changes in urinary function, such as increased frequency or pain while urinating, and changes in the appearance of urine, such as the presence of blood or a cloudy appearance.

• In some cases, a kidney stone can also cause an infection, resulting in symptoms such as fever and chills.

How Is Nephroureterolithiasis Diagnosed?

• Urinalysis: A urinalysis examination is conducted to detect any signs of infection and evaluate the substance levels in the urine that could lead to the formation of ureteral stones.

• Blood Test: A blood test aims to assess the kidneys' functioning, detect infections, and identify other underlying conditions that could cause ureteral stones.

• Urinalysis: During the medical check-up, urine analysis is done to check for infection and the quantity of substances in the urine that can contribute to the formation of stones in the ureter ureteral stones.

• Blood Test: A blood test is done to check the kidney’s health and look for signs of infection and other conditions that may cause ureteral stones.

• Ultrasound: Ultrasound uses high-frequency sound waves to try to find any obstruction within the ureters.

• Computed Tomography (CT) Scan: CT scan enables the healthcare provider to locate and describe the size, hardness, and position of the ureteral stone by the use of a computer and X-rays.

• Intravenous Pyelogram (IVP): An IVP uses a special dye along with X-rays to help highlight the urinary tract, making it easier to see the stones.

• Retrograde Pyelogram: A retrograde pyelogram involves injecting a special dye into the ureter to help outline the stones.

• Magnetic Resonance Imaging (MRI) Scan: An MRI provides images of the inside of the body, including the urinary tract.

• Cystoscopy: This procedure includes inserting a small camera into the bladder through the urethra to allow the healthcare provider a detailed view of the inside of the bladder and urethra.

How to Treat Nephroureterolithiasis?

The treatment for nephroureterolithiasis depends on several factors, symptoms, and the overall health of the patient, as well as the size and location of the stones. The following are some of the treatment options for nephroureterolithiasis:

• Observation and Pain Management: If the stones are small and cause minimal discomfort, the patient is advised to drink a lot of water and wait for them to pass naturally. Pain medications may be prescribed to manage any discomfort.

• Shock Wave Lithotripsy: This procedure involves using high-energy shock waves to break the stones in the ureters into smaller pieces that can be more easily passed through the urinary tract. This is the least invasive option but may only be suitable for some.

• Ureteroscopy: During this procedure, a urologist will insert a thin, camera-equipped tube (ureteroscope) into the urethra and guide it through the bladder and into the ureter. Once the stone is located, the urologist can remove it or break it down using a laser.

• Percutaneous Nephrolithotomy (PCNL): A urologist may perform percutaneous nephrolithotomy if the stone is large or irregularly shaped. This involves making a small incision in the back and using a scope to access the kidney and remove the stones.

• Ureteral Stents: Ureteral stents are temporary, thin, and flexible tubes that open the ureters and allow urine to flow around a blocked kidney stone.

• Medical Expulsive Therapy (MET): MET is quite useful in small distal ureteral stones and some medications used here are alpha-blockers, calcium channel blockers, corticosteroids, and phosphodiesterase-5 inhibitors (PDE5).

Conclusion

Nephroureterolithiasis refers to the condition whereby a person has calculi in both the renal parenchyma and the ureter. Symptoms of nephroureterolithiasis may include severe pain in the back, side, or lower abdomen, nausea, vomiting, difficulty urinating, or a decreased amount of urine produced. Diagnosis of nephroureterolithiasis is typically made through imaging studies such as X-rays, CT scans, or ultrasounds. Treatment may involve medications to help break up the stones, or, in some cases, surgical intervention may be necessary to remove the stones. Early diagnosis and intervention are crucial for preventing complications like infection and renal function loss.