
Hydrocephalus, or excess fluid in the brain, can cause a variety of symptoms depending on the type and age of the affected individual. One type, congenital hydrocephalus, is present at birth and can sometimes be identified during an ultrasound before the baby is born. Babies born with this condition may have distinctive physical features, such as an abnormally large head. Congenital hydrocephalus can cause muscle stiffness and spasms in the baby's lower limbs, as well as irritability, vomiting, sleepiness, and poor feeding. In adults, hydrocephalus can manifest as normal pressure hydrocephalus (NPH), which is characterized by a slow buildup of cerebrospinal fluid that puts pressure on the brain and affects brain function. NPH typically occurs in older adults and can cause dementia-like symptoms, including walking and urination problems, as well as mood and behavioral changes. While the specific causes of NPH are often unknown, it can be treated through surgery or other measures to relieve symptoms.
| Characteristics | Values |
|---|---|
| Definition | Hydrocephalus is an abnormal buildup of cerebrospinal fluid (CSF) deep within the brain. |
| Symptoms | Muscle stiffness and spasms in babies' lower limbs. In adults, hydrocephalus can cause headaches, neck pain, walking problems, and urination problems. |
| Types | Congenital hydrocephalus (present at birth), acquired hydrocephalus (develops after birth), and normal pressure hydrocephalus (NPH), a slow buildup of CSF. |
| Treatment | Surgery, such as shunt placement or endoscopic third ventriculostomy, can be used to treat hydrocephalus. |
| Prognosis | If left untreated, hydrocephalus may be fatal. Early diagnosis and treatment improve the chances of a good recovery. |
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What You'll Learn

Congenital hydrocephalus can cause muscle spasms in babies
Hydrocephalus is a condition characterised by a build-up of cerebrospinal fluid (CSF) in the cavities of the brain, which increases pressure on the brain tissue. This can cause a range of symptoms, including muscle spasms and stiffness, particularly in the lower limbs. While hydrocephalus can occur at any age, congenital hydrocephalus refers to the condition when it is present at birth. It is sometimes detected during an ultrasound scan before the baby is born but is usually diagnosed soon after birth during a newborn physical examination.
The muscle spasms and stiffness associated with congenital hydrocephalus are due to the increased pressure on the brain and spinal cord, which are surrounded by CSF. This fluid buildup can cause compression and crowding of the brain tissue, leading to disruptions in brain function and resulting in muscle spasms and other symptoms. The exact presentation of symptoms may vary depending on the individual and the severity of the condition.
Treatment for hydrocephalus in children usually involves surgery to drain the excess fluid using a shunt tube. Physiotherapy following surgery is crucial to support the child's recovery and maximise their physical potential. Early diagnosis and treatment are essential, as the chances of reversing the effects of hydrocephalus are best when the condition is addressed promptly. With early intervention, many individuals with congenital hydrocephalus can recover and regain their physical abilities.
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Hydrocephalus is caused by a build-up of cerebrospinal fluid
Hydrocephalus is characterised by an abnormal buildup of cerebrospinal fluid (CSF) in the brain's cavities, or ventricles. This excess fluid can cause these cavities to widen, putting harmful pressure on the brain's tissues. This pressure can cause the brain to compress and give way, leading to a variety of symptoms.
The body typically produces enough CSF each day to flow through the ventricles and bathe the brain and spinal cord before being reabsorbed into the bloodstream. However, hydrocephalus occurs when this absorption process is disrupted. This can be due to a blockage in the flow of CSF after it exits the ventricles, or due to reduced absorption of CSF into specialised structures called arachnoid villi. In some cases, CSF can still flow between the ventricles, and the passages between them remain open.
Hydrocephalus may be congenital, present at or shortly after birth, or acquired, developing after birth. Congenital hydrocephalus can sometimes be identified before birth during an ultrasound scan. It is usually diagnosed soon after birth during a newborn physical examination, particularly if the baby's head is larger than normal. Acquired hydrocephalus can develop in both children and adults and typically causes headaches that are worse in the morning.
Normal pressure hydrocephalus (NPH) is a type of hydrocephalus that usually occurs in older adults, with an average age of over 60. It is characterised by a slow buildup of CSF, causing a gradual increase in pressure that stays within the normal range. This is because the fluid-filled ventricles compensate for the increased fluid by enlarging, and the fluid pressure in the brain may not be as high as in other types of hydrocephalus. However, the enlarged ventricles still press on the brain and can cause symptoms. NPH can be caused by various factors, including bleeding in the brain, head trauma, infection, or a complication of surgery.
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Normal pressure hydrocephalus (NPH) is a type of hydrocephalus
NPH typically affects adults over the age of 60, with an average age of around 70. It is a rare condition, but it is estimated that more than 80% of cases go unrecognized or untreated. The exact cause of most NPH cases is unknown, but it can be caused by impaired circulation and absorption of CSF, leading to a buildup of fluid. This impaired circulation and absorption can be due to various factors, including infection, bleeding, injury, or surgery. In some cases, the cause of NPH remains unclear even after a thorough medical evaluation.
The symptoms of NPH often include difficulty walking, cognitive impairment, and loss of bladder control. These symptoms can vary in severity and may emerge at different stages of the disease. NPH can also cause dementia-like symptoms, such as mild dementia, forgetfulness, and short-term memory loss. As the condition progresses, these symptoms may become more pronounced and can include personality and behavioural changes.
NPH is one of the few treatable forms of dementia, and early diagnosis and treatment improve the chances of recovery. Treatment options include surgical insertion of a shunt, a thin tube that drains excess CSF from the brain to the abdomen. However, shunting does not work for everyone, and there is uncertainty about predicting who will benefit from this procedure.
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NPH can cause dementia-like symptoms
Normal pressure hydrocephalus (NPH) is a rare brain condition that occurs when there is a slow buildup of cerebrospinal fluid (CSF) in the skull, which presses on the brain. This increased pressure disrupts brain function, causing symptoms such as difficulties with thinking, concentrating, memory, and movement.
The specific cause of NPH is typically unknown, referred to as primary or idiopathic NPH. However, secondary NPH can occur due to underlying conditions that affect the production, circulation, or reabsorption of CSF. These conditions may include brain aneurysms, intracranial hemorrhage, brain tumors, or infections of the brain or nervous system, such as encephalitis or meningitis.
While NPH does not usually cause dangerously high intracranial pressure, the slow buildup of CSF gradually compresses and crowds the brain tissue. This compression leads to the development of symptoms over time. NPH predominantly affects individuals over the age of 65, with an average onset age of around 70.
It is important to seek medical advice if any symptoms of NPH or dementia-like conditions are observed. Accurate diagnosis and early treatment are vital for the best chances of recovery and regaining abilities affected by NPH.
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Hydrocephalus can be treated with surgery
Hydrocephalus, or excess fluid in the brain, can be treated with surgery. This condition causes dementia-like symptoms, affecting walking, thinking, and the ability to control urination. It can also cause muscle stiffness and spasms in babies' lower limbs. The pressure from the fluid build-up in the brain can cause brain damage if left untreated.
There are two main types of surgery used to treat hydrocephalus: shunt surgery and neuroendoscopy. Shunt surgery involves implanting a thin tube called a shunt in the brain to drain excess cerebrospinal fluid (CSF) to another part of the body, usually the abdomen, where it can be absorbed into the blood. This lowers the risk of central nervous system damage and relieves symptoms. However, shunts may need to be replaced due to infection or blockage, and there is a risk of complications.
Neuroendoscopy, or endoscopic third ventriculostomy (ETV), is an alternative procedure where the surgeon makes a small hole in the skull and brain to allow CSF to escape to the brain's surface and be absorbed. This procedure carries a lower risk of infection than shunt surgery but may not be suitable for everyone.
In addition to these traditional surgeries, a new, minimally invasive treatment for normal pressure hydrocephalus (NPH) is being trialled by Yale Medicine. This treatment involves implanting a device called the eShunt System between a vein in the neck and a CSF pocket at the base of the skull, allowing CSF to drain without the need for drilling holes in the skull or shaving the head. This approach reduces the risk of complications and infection compared to traditional surgery.
While surgery can be a frightening prospect, it is often necessary to treat hydrocephalus effectively. It is important to prepare for surgery by learning about the procedure, getting to know the medical professionals involved, and asking any questions you may have.
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Frequently asked questions
Hydrocephalus, or "water in the brain", is an abnormal buildup of cerebrospinal fluid (CSF) in the brain's cavities, or ventricles. This buildup of fluid can lead to pressure on the brain and a range of symptoms.
Congenital hydrocephalus, which is sometimes identified before birth during an ultrasound scan, can cause muscle stiffness and spasms in a baby's lower limbs. It is usually diagnosed soon after birth during a newborn physical examination.
Symptoms of hydrocephalus vary depending on the type of hydrocephalus and the age of the person affected. Congenital hydrocephalus is suspected if a baby's head is larger than normal. Acquired hydrocephalus, which develops in children or adults, can cause headaches, especially upon waking up in the morning, neck pain, walking problems, and urination problems. Normal pressure hydrocephalus (NPH) causes dementia-like symptoms, including problems with walking, bladder control, and difficulties with thinking and reasoning.




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