What is Tolosa-Hunt Syndrome?

Tolosa-Hunt syndrome (THS) otherwise known as recurrent ophthalmoplegia, is a rare condition with an estimated annual incidence rate of 0.7 per million.¹ Notable symptoms include cluster headaches and restricted eye movements.² It is an idiopathic condition, meaning that the cause is unknown and it can arise spontaneously from numerous factors, including the inflammation of the cavernous sinus (a group of sinuses in the cranial cavity) or orbital apex (eye canal).^3,4 It presents through an abnormal thickening of the cavernous sinus, which can be seen through MRI imaging.⁵ Other causes of this condition are trauma, neoplasm and aneurysm.⁶ 

In a conducted study, it was concluded that the average age was 49 years when symptoms first developed, with 50% of the patients having recurring symptoms sometimes years after the first diagnosis. The most notable symptoms first recognised by the patients were periorbital pain, unilateral headache, drooping of eyelids and facial numbness.⁷ In most cases, the treatment strategies include the prescription of steroids with pain relief; however, the success rate of this varies from patient to patient, with some rapidly improving whilst others have prolonged symptoms.⁸ It is important to note that pediatric patients, most notably those aged between 11-15, may also suffer from this condition.⁹ This will be discussed further in this article whilst also looking at the differences in presentation of this condition as well as the potential differentiation in treatment strategies for these age groups. 

THS is a rare, but profound condition that can cause severe headaches and issues with the movement of the eyes. In this article, we will explore the key differences in the presentation of THS in children and adults, the challenges in diagnosis and the most effective treatment options. 

Symptoms of THS

The most common symptoms for THS include:¹⁰

• Orbital pain  (pain in the eye)
• Diplopia (double vision)
• Cranial nerve palsy ( difficulty in moving the face or eye)
• Optic nerve involvement (pain with eye movement or temporary vision loss)
• Facial nerve palsy (weakness of facial muscles)
• Periorbital headaches (cluster headaches at the front of the head)

It should be noted that patients may have one or multiple of the aforementioned symptoms. 

In children and adolescents, according to one study, the symptoms predominantly found in female patients aged between 8-15 were headaches (48%),  retro-orbital pain (56%) and cranial nerve palsies (66%), with the median duration of these lasting two weeks before treatment was administered.¹¹

In an observational study, the clinical and diagnostic profiles of this syndrome were analysed across seven years in adults.  In adults, the condition affects mostly men (66.6%), around 51 years old, with the initial symptoms being restricted eye movements (51.7%) and nerve palsy (60%).¹² Both adults and children present with nerve palsies; however, whilst children have headaches, adults tend to have more restricted eye movements. This is solely based on the two above studies and does not state with certainty that being an adult limits you to two symptoms. In fact, as an adult or a teen/ child, you should be aware of all the symptoms, as it can present differently from person to person, and medical advice should be sought out. 

Similarities vs Differences in Pediatric vs. Adult THS

To commence, let’s discuss the similarities between these two age groups, and then we will discuss in more detail the differences. In one literature review, it seems that the syndrome follows a similar course in both children and adults, with MRI being a major diagnostic tool.¹³

It is therefore clear that the diagnostic tool used by medical professionals is the same for both; however, in children, the diagnosis is more challenging as symptoms are milder. In a scientific case report, it was deduced that the syndrome is rare amongst children, which makes it difficult to diagnose, and as a result, doctors need to do more through prelim and preliminary diagnosis.¹⁴

As previously discussed, the condition is rarer amongst the paediatric population, however, similarly, it is also misdiagnosed amongst adults. In adults, it is often misdiagnosed as a complication of sinusitis, the inflammation of the sinuses due to an infection and an MRI is encouraged and with follow-ups with the patient to prevent any misdiagnosis.¹⁵

Despite the similarities in diagnostic tools and the occurrence of misdiagnosis,  there is a scarce amount of data currently available comparing the symptom progression of adult and pediatric patients with THS. Further research may enable researchers to optimise clinical detection and medical management of this disease regardless of age or gender.¹⁶

Treatment and Response to Therapy

The primary treatment for the syndrome is corticosteroid therapy for both children and adults; nonetheless, the following treatment approaches are available:¹⁷

Corticosteroid treatment

This is the first line treatment. Usually, 40-80mg of prednisone is prescribed for 2-4 weeks, followed by a gradual taper over 4-6 weeks to prevent any recurrence. Symptoms often ameliorate within 24-72 hours, and full recovery can often be seen within weeks. 

Steroid-sparing agents

In patients who can not tolerate corticosteroids or require long-term immunosuppression, steroid-sparing agents may be considered. In some resistant cases, biologic therapies such as rituximab have been used to alleviate symptoms.

Pain management 

In terms of symptom relief, NSAIDs such as paracetamol or ibuprofen can be taken to alleviate mild to moderate pain. Please consult with a pharmacist for the relevant dose and type of medication for your child. 

Radiotherapy (rarely used)

Corticosteroid-resistant or recurrent patients may be offered low doses of radiotherapy. The low doses of radiation are utilised to reduce the inflammation and minimize the symptoms upon corticosteroids being ineffective. Per contra, radiotherapy is usually limited due to it’s potential side effects, and it’s typically a last resort option. 

Surgical intervention 

In very rare cases and with a doctor's consultation, surgical intervention may be required. This is usually for patients with structurally significant involvement, such as cavernous sinus mass effect, or in other words a tumour within the eye socket. Any abnormal inflammation or growths should be looked at by a medical professional as these could be due to other conditions. 

Response to Therapy

In most cases, patients improve significantly as a result of the corticosteroid therapy, with pain relief also. There is a high rate of remission, with an estimated  30-40% of patients relapsing. In some cases, patients may not respond to steroids, or there may be a slower recovery rate in more severe cases.¹⁸

Summary 

Tolosa-Hunt Syndrome (THS) is a rare condition causing severe headaches and eye movement problems. It affects both children and adults in similar ways, though children tend to have initially more headaches, whilst adults tend to have more restricted eye movement problems. 

Diagnosis is conducted through MRI scans, and the treatment plan is corticosteroids, which usually provides quick relief. However, some patients may relapse and require additional therapies for pain management, or, in rare cases, surgery.

THS can be difficult to diagnose, especially in children, due to mild symptoms. More research is needed to improve early detection and treatment for better patient outcomes in both children and adults. 

A similar condition is cavernous sinus syndrome (CSS), which also affects the eye. Despite this, the origins of both conditions differ as THS is considered to be an idiopathic condition, whilst CSS is caused by an underlying condition such as a tumour or infection.¹⁹ Both have similar symptoms, but despite that, CSS may also include bulging eyes, fever and signs of systemic disease.²⁰ THS responds well to steroids, whereas CSS has broader symptoms as indicated above, and treatment needs to be tailored according to the root cause of the condition. In some cases, CSS has been treated with antibiotics, but it depends on whether it originates from an infection or other sources.²¹ It is also a condition that is rarely seen in children. If you have any symptoms or wish to seek treatment, please consult a medical professional.