If you are an expectant mother, you may have heard the word 'Ventriculomegaly' during your scan. You must have felt a great sense of fear and shock upon hearing it, right? You must have thought, 'Oh, is there something seriously wrong with my baby?' It is normal for many mothers to feel that way at times like this. So, without further ado, let's talk about this condition called 'Ventriculomegaly' today in a simple, understandable way.
What is Ventriculomegaly?
Simply put, Ventriculomegaly is when the fluid-filled cavities inside your baby's brain (we call them 'ventricles') become larger than normal. Think of it like this: our brains have these little chambers inside them. Inside these chambers is a special fluid called 'cerebrospinal fluid' or 'CSF'.
This `(CSF)` fluid is very important. It is like a protective cushion for our brain and spinal cord. That is, it protects these organs from harm, nourishes them, and removes waste. Normally, this `(CSF)` fluid is produced, travels in and around the brain, and then is reabsorbed back into the body. This is something that happens constantly, like a cycle.
However, sometimes if there is an obstruction in the pathways through which this `(CSF)` fluid travels, or if there is an imbalance between the production and absorption of the fluid, this fluid gets trapped inside the cavities called ventricles and starts to accumulate. That is when those cavities gradually get bigger, like a balloon filling with water. This is what we call `Ventriculomegaly` during the fetal stage, that is, when the baby is in the womb.
You may have also heard the term 'hydrocephalus'. This is also a condition where the ventricles become enlarged due to the accumulation of cerebrospinal fluid (CSF), which also increases pressure on the brain. Doctors usually diagnose the condition 'hydrocephalus' after the baby is born. If a baby's ventricles are enlarged in the womb, it is called ventriculomegaly.
Is this a common condition?
According to data from the United States, this condition can affect about two out of 1,000 live births. But the important thing is that most of the time, this is a mild condition, and it does not cause any complications when the baby is born. In most cases, these ventricles stop growing, or shrink back to normal size. So there is no need to be too scared when you hear this name.
What are the symptoms of Ventriculomegaly?
Most of the time, a baby with ventriculomegaly will not show any outward signs. Your doctor will likely find that your baby's ventricles are enlarged during a routine ultrasound during pregnancy. Babies with mild ventriculomegaly usually don't show any symptoms after birth.
However, if the condition is severe, the baby may show signs of hydrocephalus a few days after birth. These signs include:
- The baby's head is unusually large or the head size suddenly increases.
- The delicate spot on the top of the baby's head (fontanel) appears swollen and bulging.
- The eyes are unable to look straight up, and appear to be turned downward (downward gaze).
- Excessive fatigue or constant restlessness and crying.
- Frequent vomiting.
- Difficulty or reluctance to drink milk.
What causes this?
Ventriculomegaly can have several causes. Sometimes , no clear cause can be found. The important thing to remember is that this condition is usually a random occurrence, not something inherited from the parents' genes or caused by environmental factors .
The two most common reasons are:
- There is some obstruction or imbalance in the free movement of the ``CSF'' fluid we talked about and its natural absorption into the body.
- An injury or other problem may affect the development of the baby's brain.
Is this a genetic thing?
No. Ventriculomegaly is not a hereditary condition. This means that it is a random occurrence and not something that is passed down from mother to child.
What are the risk factors?
Ventriculomegaly is often a coincidence. It can occur alone or in conjunction with other complications during pregnancy. Some studies have shown that the following conditions may slightly increase the risk of a baby developing ventriculomegaly:
- Spina bifida (a birth defect involving the spinal cord).
- Agenesis of the corpus callosum (ACC) (failure to develop properly of the structure that connects the two halves of the brain).
- Infections in the pregnant mother, for example, syphilis or cytomegalovirus (CMV).
- Chromosomal abnormalities, for example, Down syndrome.
What are the possible complications?
The future of a baby with ventriculomegaly depends on the severity and underlying cause. In general, if the ventricles are only slightly enlarged and the ultrasound does not show any other abnormalities, the outcome is generally good.
However, a baby with very large ventricles, or a baby with other health problems that are present at birth along with enlarged ventricles, is at higher risk of complications. Although rare, babies born with severe ventriculomegaly may have neurological problems or developmental delays.
Can a baby with ventriculomegaly survive?
Yes, absolutely. Ventriculomegaly is a treatable condition.
How is Ventriculomegaly diagnosed?
Doctors usually diagnose this condition during a fetal anatomy scan, which is done between 18 and 22 weeks of pregnancy. Sometimes it can be diagnosed later in pregnancy. During this ultrasound, the doctor measures certain parts of the baby's brain. If the measurement is abnormally large, it could mean that the baby has ventriculomegaly.
Then, your doctor may order more imaging tests, such as a fetal MRI (fetal Magnetic Resonance Imaging - MRI). This can take very clear pictures of the baby's brain, so the doctor can see the baby's ventricles in more detail. The MRI is completely safe.
Your doctor will likely order more ultrasounds throughout the remainder of your pregnancy to monitor the amount of fluid in the baby's brain ventricles.
In some cases, a test called amniocentesis may be performed. This involves the doctor using a thin needle to take a small sample of the amniotic fluid surrounding the baby. This fluid can be tested to see if there are any infections, such as cytomegalovirus.
After the baby is born, another ultrasound or MRI of the baby's brain is performed to determine whether the baby has hydrocephalus and whether surgery is needed.
Criteria for diagnosing ventriculomegaly
The severity of fetal ventriculomegaly is measured by the width of the ventricle. In a normal fetus, the ventricles of the brain are less than 10 millimeters (mm) wide – about the width of a pea.
- Mild: Ventricles between 10 and 12 mm.
- Moderate: Ventricles between 13 and 15 mm.
- Severe: Ventricles are wider than 15 mm.
How is it treated?
Ventriculomegaly is treated after your baby is born, and it is usually only needed if your baby is showing signs of hydrocephalus.
A doctor will do an ultrasound or MRI of the baby. If there is still an unsafe amount of fluid in the baby's ventricles, brain surgery may be needed to reduce the amount of fluid and pressure on the brain.
The most common type of surgery is to place a shunt in the baby's brain to remove the fluid (ventriculoperitoneal shunt surgery). A shunt is a flexible tube that allows the extra cerebrospinal fluid (CSF) to flow to another part of the body (such as the stomach).
In some cases, another type of surgery called an endoscopic third ventriculostomy (ETV) may be needed. In this procedure, a surgeon inserts an endoscope through the top of the baby's head (the fontanel). This creates another path for cerebrospinal fluid (CSF) to flow into and around the brain.
Can ventriculomegaly get better on its own?
Yes, sometimes ventriculomegaly can get better without any treatment. Or it can stay that way and go away on its own before the baby is born. Your doctor will monitor the size of the baby's brain ventricles throughout the rest of your pregnancy.
What happens if my baby has ventriculomegaly?
If you are diagnosed with this condition during pregnancy, your doctor will closely monitor your baby's brain. After your baby is born, they will check to see if the baby's ventricles are enlarged. If there are no signs of enlarged ventricles or pressure on the brain, your baby may not need surgery after birth. Most babies with mild conditions do not have any long-term health effects.
Children born with ventriculomegaly may later develop hydrocephalus. In such cases, surgery may be necessary. The baby will also need to be monitored for several years after surgery to ensure that the pressure in the baby's brain remains normal.
Should you be worried about ventriculomegaly?
If a fetus has mild ventriculomegaly and no other health conditions, there is about a 90% chance that ventriculomegaly will not cause any long-term effects.
It's normal to feel anxious when you hear that your baby may be born with a medical condition. Ask your doctor any questions you have. They will help you ease your fears about whether your baby will be healthy. They will do everything they can to support you.
Does this affect childbirth?
Usually not. If the baby's head is not too big, you can have a normal vaginal delivery. If there are other medical problems or the baby's head is too big, you may need a cesarean section (C-section). Your doctor may also recommend that you deliver your baby in a hospital that specializes in treating babies with special needs. This is because there are specialist doctors and facilities such as a Neonatal Intensive Care Unit (NICU).
Can ventriculomegaly be prevented?
No. There is nothing you can do to prevent ventriculomegaly. It is not your fault.
Does ventriculomegaly mean a baby has Down syndrome?
This is not necessarily true. There is a link between ventriculomegaly and Down syndrome. A fetus with enlarged ventricles may be at slightly increased risk of developing chromosomal disorders such as Down syndrome. However, having ventriculomegaly does not necessarily mean that your baby will have Down syndrome.
What questions should you ask the doctor?
It's normal to have questions about the diagnosis of Ventriculomegaly. You can ask your doctor these questions:
- Do I need to do more tests?
- Is there anything I should do differently because of this diagnosis?
- Is there a treatment for Ventriculomegaly?
- Will my baby have cognitive or developmental delays?
- Will I need surgery after my baby is born?
In summary (Take-Home Message)
Receiving a diagnosis of Ventriculomegaly during pregnancy can be a sudden shock. You may be wondering, "Is there something wrong with my pregnancy?" or "Did I do something wrong?" Please remember, you did nothing wrong, and most of the time your baby will be born healthy. Talk to your obstetrician about what this diagnosis means and what care you will need after birth. He/she is there to answer your questions and take all necessary steps to keep your pregnancy and baby healthy. Don't panic, and follow your doctor's advice.
` Ventriculomegaly, fetal brain, CSF, hydrocephalus, pregnancy scan, baby health, brain cavities
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