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What is a hypothalamic hamartoma (HH)?

Hypothalamic hamartomas (HH) are rare, benign (noncancerous) tumors of the hypothalamus, a region of your brain that regulates many of your body’s systems. Hypothalamic hamartomas affect children from infancy through adulthood and commonly cause seizures, precocious (early) puberty, hormonal imbalances, and cognitive and behavioral problems.

Hypothalamic hamartomas are usually diagnosed during evaluation of patients for epilepsy or precocious puberty.


How are hypothalamic hamartomas diagnosed?

Your neurological symptoms, magnetic resonance imaging (MRI), and neurological tests are examined if a hypothalamic hamartoma is suspected. Early detection can improve the likelihood of successful treatment, especially for children who have worsening seizures or whose learning skills or behavior have begun to deteriorate.


MRI is used to locate your hypothalamic hamartoma and confirm your diagnosis. Hypothalamic hamartomas can be small and difficult to detect, so interpretation by a doctor that specializes in neuroradiology is desirable. Electroencephalography (EEG) may also be used to identify seizure patterns that suggest a hypothalamic hamartoma.


How common are hypothalamic hamartomas?

Hypothalamic hamartomas are rare, and occur at a rate of 1 in every 200,000 people.

What are the treatment options for hypothalamic hamartomas?


Surgical Removal

Our neurosurgeons are one of just a few groups in the world with significant experience using the transcallosal approach to remove hypothalamic hamartomas. This approach uses the natural gap between the two hemispheres of your brain to create an avenue to access and remove the tumor.


We also use more traditional subtemporal or orbitozygomatic approaches if they offer the best chance of success. This surgery begins on the side of your head and passes under your brain and above the base of your skull to reach the lesion.

Less-invasive endoscopic surgery can be considered when the size and exact anatomical positioning of the lesion allows.


Laser Generated Stereotactic Thermoablation

Laser generated stereotactic thermoablation is a new minimally invasive technology that uses energy in the form of light to destroy tumors or damaged tissue. The energy from the laser causes the temperature of the target tissue—in this case your hypothalamic hamartoma—to rise, destroying it.


Computerized safety mechanisms automatically turn the laser off if it approaches brain tissue surrounding the tumor. Magnetic resonance images (MRI) are also used further improve the accuracy of the procedure and guide the placement of the laser.


Gamma Knife Radiosurgery

Gamma Knife radiosurgery uses many beams of radiation that converge on a single point to shrink tumors. Each individual beam is not powerful enough to destroy healthy tissue, but at the point where the beams meet sufficient energy is concentrated to destroy tumor cells.

What are the symptoms of a hypothalamic hamartoma?

The symptoms of hypothalamic hamartoma (HH) include:

  • seizures

  • precocious (early) puberty

  • hormone imbalances

  • cognitive impairment

  • behavioral problems

  • emotional difficulties

Seizures caused by a hypothalamic hamartoma usually begin in infancy, most often as brief and frequent gelastic (or laughing) seizures. You may not be able to tell the difference between a gelastic seizure and normal laughter.

The difficulty in identifying gelastic seizures usually delays the diagnosis of epilepsy and of the hypothalamic hamartoma. Even doctors can have difficulty recognizing gelastic seizures because they are rare and affected children generally develop normally.

Between the ages of 4 and 10 years old, you may notice the seizures becoming more disabling, with the emergence of different seizure types, such as:

  • complex partial seizures (diminished or altered consciousness with involuntary but coordinated movements)

  • generalized convulsions (involuntary shaking, twitching, and disorganized movements)

  • drop or atonic seizures (brief loss of muscle tone leading to falls)

In this stage, your child may display signs of progressive cognitive impairment, worsening school performance, and the following behavioral problems:

  • tantrums

  • rage attacks

  • social isolation

Some children with a hypothalamic hamartoma may have endocrine (hormonal) disturbances. Central precocious puberty (early puberty) is the most common sign of these disturbances, and may be the only symptom of hypothalamic hamartoma that your child has.

Not all people with a hypothalamic hamartoma have the same symptoms or the same age of onset. While you might notice gelastic seizures in your newborn, it is also possible that seizures will not develop until later in life. Seizures caused by a hypothalamic hamartoma generally do not respond to medication.


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Hypothalamic Hamartoma