Patient with Cluster Headache and Harlequin Sign - Related or Not?

BACKGROUND: The harlequin sign or syndrome is a rare cranial autonomic condition characterized by unilateral diminished flushing and sweating of the face (and sometimes arm), in response to heat or exercise. It results from autonomic, mainly sympathetic dysfunction. Although the idiopathic form is the most common, underlying structural abnormalities in the head, neck, and thorax need to be excluded. METHODS AND
RESULTS: Here, we describe the first case of the combination of primary cluster headache and the harlequin syndrome in a 49-year-old female patient. The patient presented with a first bout of cluster headache with persisting Horner syndrome and new harlequin sign after the bout. Additional neuroimaging did not reveal underlying pathologies. This report provides an overview of cases from the literature and then discusses the association between primary headaches and the harlequin syndrome. Relevant anatomy, diagnostic tools, and therapeutic options are all considered.
CONCLUSION: This case reports a rare combination of cluster headache and harlequin sign that warrants further testing to exclude pathology in the brain, neck or mediastinum. It also illustrates the underlying anatomy and physiology of the autonomic nervous system.

Introduction

The harlequin sign or syndrome is a rare cranial autonomic condition that is characterized by a hemifacial redness and perspiration in response to heat or exercise. In some patients, 1 arm is affected as well. These symptoms are almost always caused by a disorder in the functioning of the sympathetic nervous system. In the majority of cases, this disorder is idiopathic, without underlying structural abnormality. Secondary causes are rare but need to be excluded. Here, we report the case of a 49‐year‐old female patient who presented with primary cluster headache who, after the first bout, developed hemifacial redness and transpiration after jogging. We diagnosed her with harlequin syndrome. In addition, we give an overview of all 10 patients that have been described in the literature until now with the combination of a primary headache disorder and the harlequin syndrome, of whom only 1 had (non‐concomitant) cluster headache.

Case Report

A 49‐year‐old woman presented with attacks of very severe, stabbing, pain behind the left eye with ipsilateral ptosis and miosis (Horner's syndrome), conjunctival injection, lacrimation, and obstructive nasal complaints during 2 months. She also reported the urge to move during the attacks, which lasted for 2‐3 hours each up to twice per day. The family history was negative for primary headache disorders. The neurological examination and an MR‐scan of the brain were unremarkable and a diagnosis of the first bout of cluster headache was made. The patient was able to successfully abort the attacks using subcutaneous sumatriptan injections and oxygen inhalation therapy. After this first bout subsided, the Horner's syndrome persisted. A few weeks later, she again reported that the right side of her face had turned red during jogging, while the left side retained its normal color (Fig. 1). At that time, she no longer had cluster attacks. She also no longer perspired on the left side of her face. Horner's syndrome had not changed. Additional neuroimaging tests were performed (CT‐angiography of the cerebral vessels and carotid arteries; X‐ray of the chest) and showed no abnormalities. Specifically, there were no signs of a carotid artery dissection or a tumor in the trajectory of the vagal nerve/cervical sympathetic trunk. Pharmacological studies into papillary signs were not performed since they had no additional diagnostic value in this case. The patient was reassured by the absence of underlying pathology and her symptoms decreased to some extent over a few months. One year later, she reported 1 new bout of cluster headache for which she successfully started verapamil as a prophylactic treatment in addition to her attack treatment. She did not require any symptomatic treatment for the harlequin sign. Altogether, this appears to be the clinical image of the harlequin syndrome, most probably in association with her cluster headache.

Fig. 1

The patient's face after jogging showing physiological right‐sided flushing of the face and pathological left‐sided absence of flushing, ptosis, and miosis.

Discussion

The Harlequin Syndrome

The harlequin sign or syndrome is a rare, cranial, autonomic nervous system condition that is characterized by hemifacial redness and perspiration in response to heat or exercise. The syndrome was first described by James Lance in 1988 and was named after the resemblance that the faces of patients had with his son's toy harlequin [personal communication PJ Goadsby]. Until that point, the harlequin syndrome was only used for vasomotor instability and/or ichthyosis congenita in children.

Typically, the blushing, red, and perspiring side of the face is most prominent for patients. Therefore, this side with symptoms was initially assumed to be the pathological side of the face. Later it was discovered that the non‐blushing, anhidrotic side was pathologic and that it was mainly due to sympathetic dysfunction. Pharmacological studies into pupillary reactivity showed parasympathetic dysfunction in some patients as well. Nowadays, the harlequin syndrome is considered to be a condition within the spectrum of cranial autonomic disorders that also includes Holmer‐Adie's and Horner's syndromes. In the literature, a total of approximately 90 cases of harlequin syndrome have been reported. , , , The majority are primary or idiopathic. Only a few patients have an underlying (structural) pathology is found.

Anatomy

Perspiration and blushing are both functions of the sympathetic nervous system, of which the vasomotor and sudomotor innervation origin from the hypothalamus (Fig. 1). From here myelinated axons project caudally to the ganglions within the sympathetic trunk: the centrum ciliospinale at the level of C8‐Th1 (facial innervation) and at Th1‐Th4 (innervation of the arm) (Fig. 2). Sympathetic dysfunction and the symptoms described above can result from a dissection of the carotid artery, an aneurysm of the cerebral vessels, or a (space‐occupying) lesion in the brainstem, neck, apex of the lung or mediastinum (trajectory of the vagal nerve or sympathetic trunk). , For exclusion of underlying causes, an MR scan of the brain/neck region, a doppler ultrasound of the carotid arteries, a CT‐angiography of the neck and cerebral arteries, and/or an X‐ray of the chest can be considered.

Fig. 2

Sympathetic innervation of the face and arm (adapted from Wasner et al ). Myelinated fibers project from the anterior cingulate cortex via the hypothalamus to the centrum ciliospinale within the spinal cord (1st order neuron). From thereon, fibers radiate via the anterior horn to ganglions in the sympathetic trunk (2nd order neuron): from C8‐Th1 fibers travel to the face and from Th2‐Th8 fibers travel to the arm. Unmyelinated fibers, separate for vasomotor and sudomotor activity, accompany peripheral nerves from the truncal ganglions to the organs (3rd neuron). Facial sympathetic innervation originates in the ganglion cervical superius. Fibers partially travel along either the internal carotid artery (innervation of the medial side of the forehead, eyes, and nostrils) or along the external carotid artery (rest of the face) and are distributed over the face alongside the branches of the trigeminal nerve. The cheeks are innervated in both ways. Sympathetic innervation of the arm and hand continues from the roots Th2‐Th8, via the ganglion cervicothoracicum (stellatum) to the plexus brachialis and further alongside peripheral nerves.

Headache and the Harlequin Syndrome

Some patients with harlequin syndrome also report headaches, as was first described by Lance et al. Although rare, this co‐morbidity enables us to hypothesize about the underlying pathophysiology. The literature has so far described a total number of 10 patients with both harlequin syndrome and a co‐morbid primary headache disorder. , , , , Recently, an overview of the clinical characteristics of 9 out of these 10 patients has been presented. With the data from our case included, Table 1 gives an overview of all 10 patients.

Table 1

Overview of patients with harlequin syndrome and co‐morbid primary headache disorder (adapted from Fiana et al )

	Patient	Fiana et al 4 1	Fiana et al 4 2	Fiana et al 4 3	Lance et al 1 1	Lance et al 1 2	Drummond et al 2	Corbett et al 9	Fallon et al 10	Willaert et al 3	Lehman et al 5
Sex	F	F	F	F	F	M	F	F	F	F	M
Age, year	49	42	58	69	58	42	44	37	51	43	63
HS
Age	49	40	41	50	54	37	26	37	51	43	60
Side	Left	Left	Left	Right	Left	Left	Right	Left	—	Left	Right
Headache before HS	Simultane	Yes	Simultane	Yes	Yes	Yes	Simultane	Yes	Yes	Yes	Simultane
Age	49	30	41	20	36	37	26	—	—	—	60
Diagnosis	CH	MO	MO	MA	TTH†	MO	MO	Migraine	Migraine‡	Migraine	CH
Localization	Left	Bilateral	Right	Left> Right	Right	Right	Right	—	—	—	Right
Frequency	1‐2/day	1‐2/month	4/month	0,5/month	—	—	—	—	—	—	1‐3/day
Headache exertion	Yes	Yes	Yes	No	No	No	After.	No	No	No	—
Diagnosis	PEH	PEH	MO				MO
Side	Left	Left	Right				Right

In total, 8/11 patients have migraine, 1/11 has post‐traumatic headache (phenotypically tension‐type headache). The patient described in this case report is the second patient with both cluster headache and harlequin syndrome. In 8 patients, harlequin syndrome developed after the onset of headache, in 3 patients this was approximately simultaneous. Headache during exercise was reported by 4/11 patients.

CH = cluster headache; F = female; HS = harlequin syndrome; M = male; MA = migraine with aura; MO = migraine without aura; PEH = primary exertional headache; TTH = tension type headache; — = not mentioned or specified in reference.

Right‐sided dull headache without accompanying symptoms since a car accident 22 years earlier.

Reported as “classic migraine”.

Between migraine and harlequin syndrome, a pathological association does not seem likely. In the reported cases the patients had been free of attacks for years or the harlequin symptoms were not simultaneous with the migraine attack. This is underlined by 2 pharmacological observations: sumatriptan and dihydroergotamine did not have any effect on the harlequin syndrome (but were able to successfully treat migraine headache), and intravenous administration of nitroglycerin (a validated experimental model for migraine attack provocation) was able to trigger a migraine attack but not the harlequin symptoms. Furthermore, one of the 2 patients in whom the migraine and the harlequin syndrome developed simultaneously , had a severe ENT‐infection and a tonsillectomy shortly before, which are a very likely cause. The association, therefore, can be considered incidental.

One cluster headache patient was described in the literature as experiencing his first bout at the age of 60 years. The harlequin symptoms, however, were not simultaneous with the cluster attacks and both had started after a complicated ipsilateral dental root procedure suggesting an iatrogenic cause. The patient in this case report is the second such case described, and the first one with primary cluster headache and the harlequin sign. Dysfunctioning of the (sympathetic) autonomic nervous system is a plausible explanation for both disorders. The harlequin syndrome in this case can be seen as due to the autonomic dysfunctioning in cluster headache. However, a shared, underlying (structural) cause cannot be excluded fully. Follow‐up neuroimaging tests will be planned for our patient.

Therapy

The treatment for harlequin syndrome depends primarily on the underlying cause. Structural lesions need to be addressed according to pathology. In the idiopathic form, a symptomatic treatment is seldom warranted, as the symptom severity seems to decrease over time. Patient reassurance is important, as symptoms can be quite striking and upsetting. Onabotulinum toxin injections and surgical sympathetic denervation on the non‐pathological, contralateral side of the face and arm are treatment options when patients suffer socially from asymmetric hyperhidrosis and blushing.

Conclusion

The harlequin sign or syndrome is a rare, cranial, and autonomic disorder that is characterized by hemifacial redness and perspiration (sometimes including the arm as well) in response to heat or exercise. On pathology considerations, an association with cluster headache is plausible, but not with migraine. In most cases, harlequin syndrome is idiopathic. Underlying causes such as a dissection of a carotid artery, cerebral aneurysm of (space‐occupying) lesion in the brainstem, neck, apex of the lung or mediastinum should be excluded using (follow‐up) neuro‐imaging. Treatment depends on the underlying cause if present. Idiopathic forms seldom need treatment.

Statement of Authorship

Category 1

(a) Conception and Design

W.P.J. van Oosterhout

(b) Acquisition of Data

W.P.J. van Oosterhout

(c) Analysis and Interpretation of Data

W.P.J. van Oosterhout

Category 2

(a) Drafting the Manuscript

W.P.J. van Oosterhout

(b) Revising It for Intellectual Content

W.P.J. van Oosterhout

Category 3

(a) Final Approval of the Completed Manuscript

W.P.J. van Oosterhout