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What is hydrocephalus?
Hydrocephalus is a condition in which there is a lack of absorption, blockage of flow, or overproduction of the cerebral spinal fluid (CSF) that is found inside the ventricles (fluid-filled areas) of the brain. This may result in a build up of fluid that can cause the pressure inside of the head to increase and the skull bones to expand to a larger-than-normal appearance.
What causes hydrocephalus?
Hydrocephalus occurs in approximately 0.5 to one out of 1,000 births. The following are the primary reasons why hydrocephalus occurs:
- Blockage of the CSF flow inside of the head.
- Problems with the body absorbing the CSF.
- Overproduction of the CSF.
Hydrocephalus can occur either as a condition present at birth (congenital), or it can be acquired later in life. When hydrocephalus is not related to a known genetic cause, it is thought that many factors, both genetic and environmental, contribute to the condition. In a small percentage of children, a single gene defect on the X chromosome, or another chromosome, is responsible for the condition. In these cases, the chance for recurrence is higher. Once a child has been born with hydrocephalus that is not known to be caused by a single gene defect, the chance for it to happen again in another child is 1 to 5 percent.
Causes of acquired hydrocephalus may include the following:
- Bleeding inside the head.
- Birth injury.
- Abnormal blood vessel formation inside of the head.
What are the symptoms of hydrocephalus?
The following are the most common symptoms of hydrocephalus. However, each child may experience symptoms differently. Symptoms of hydrocephalus in younger children may include:
- A full or bulging fontanelle (soft spot located on the top of the head).
- Increasing head circumference.
- Bulging eyes and an inability of the child to look upward with the head. Facing forward.
- Very noticeable scalp veins.
- Increased irritability.
- High-pitched cry.
- Poor feeding.
- Projectile vomiting. Sleepiness or less alert than usual.
- Developmental delays.
In cases where hydrocephalus is not congenital, but is due by a tumor, trauma, infection, or other causes, the symptoms typically seen in older children may include the following:
- Complaints of severe headaches.
- Nausea and vomiting.
- Changes in personality, behavior, or school performance.
- Problems with bowel or bladder control.
- Increased movement in the arms or legs.
The symptoms of hydrocephalus may resemble other conditions or medical problems. Always consult your child's physician for a diagnosis.
How is hydrocephalus diagnosed?
Hydrocephalus may be diagnosed before birth by prenatal ultrasound, a diagnostic imaging technique which uses high-frequency sound waves and a computer to create images of blood vessels, tissues, and organs. Ultrasounds are used to view internal organs as they function, and to assess blood flow through various vessels. In many cases, hydrocephalus does not develop until the third trimester of the pregnancy and, therefore, may not be seen on ultrasounds performed earlier in pregnancy.
The diagnosis of congenital hydrocephalus may also be made at birth after diagnostic testing. During the examination, the physician obtains a complete prenatal and birth history of the child. He/she may also ask if there is a family history of any hydrocephalus or other medical problems. The physician will also ask about developmental milestones in older children since hydrocephalus can be associated with other neuromuscular disorders. Developmental delays may require further medical follow-up for underlying problems.
The child's head may appear larger than normal. A measurement of the circumference of the child's head is taken and compared to a scale that can identify normal and abnormal ranges.
Diagnostic tests that may be performed to confirm the diagnosis of hydrocephalus include:
- X-ray - a diagnostic test which uses electromagnetic energy beams to produce images of internal tissues, bones, and organs onto film.
- Magnetic resonance imaging (MRI) - a diagnostic procedure that uses a combination of large magnets, radio frequencies, and a computer to produce detailed images of organs and structures within the body.
- Computerized tomography scan (Also called a CT or CAT scan.) - a diagnostic imaging procedure that uses a combination of x-rays and computer technology to produce cross-sectional images (often called slices), both horizontally and vertically, of the body. A CT scan shows detailed images of any part of the body, including the bones, muscles, fat, and organs. CT scans are more detailed than general X-rays.
Treatment of hydrocephalus
Specific treatment for hydrocephalus will be determined by your child's physician based on:
- Your child's age, overall health, and medical history.
- The extent of the condition.
- The cause of the condition.
- Your child's tolerance for specific medications, procedures, or therapies.
- Expectations for the course of the condition.
- Your opinion or preference.
The goal of treatment is to reduce the pressure in the child's head and to properly drain the cerebral spinal fluid (CSF). Occasionally, medications or procedures to draw off the extra CSF may be used.
Surgery may be needed for some cases of hydrocephalus. Surgery usually involves placing a mechanical shunting device into the child's head to help drain the extra CSF from the brain and redirect the extra fluid to another part of the body to be absorbed. A common type of shunt is the ventriculoperitoneal shunt.
The shunt consists of three parts:
- A tube that is placed inside of the ventricular space.
- A reservoir and valve to control the flow of CSF.
- Tubing that is directed under the skin to the abdomen, or less commonly to the heart or lung area.
The shunt redirects the CSF out of the head through the tubing to a location elsewhere in the body where it can be absorbed. The shunt is usually placed behind the ear and the tubing is threaded from behind the ear, under the skin to the area of the abdomen, heart, or lung. Your child's physician will determine the drainage location based on your child's condition, age, and other factors.
Potential complications from the shunts or surgery can include the following:
- Shunt malfunction that results in under-drainage or over-drainage of the CSF.
Other complications may include fever, nausea or vomiting, irritability, headache, redness and swelling along the area of the tubing, or decreased alertness or complaints of being tired. These complications require prompt medical evaluation. Following surgery, you will receive instructions on how to care for your child at home and information about signs or symptoms requiring medical care.
Hydrocephalus can affect the brain and a child's development. The extent of the problem is dependent on the severity of the hydrocephalus and the presence of brain or other organ system problems.
The key to treating hydrocephalus is early detection, treatment, and prevention of infection. A child with hydrocephalus requires frequent medical evaluations to ensure proper shunt function. The medical team works hard with your family to provide education and guidance as your child grows and develops.
Genetic counseling may be recommended by your child's physician to discuss the risk of recurrence in a future pregnancies, as well as prenatal testing for hydrocephalus.
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