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REVIEW ARTICLE |
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Year : 2010 | Volume
: 58
| Issue : 1 | Page : 15-19 |
Ophthalmoplegic migraine : Past, present and future
Vivek Lal
Department of Neurology, PGIMER, Chandigarh - 160 012, India
Date of Acceptance | 14-Feb-2010 |
Date of Web Publication | 8-Mar-2010 |
Correspondence Address: Vivek Lal Department of Neurology, PGIMER, Chandigarh - 160 012 India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0028-3886.60388
Ophthalmoplegic migraine (OM) is a rare disorder characterized by childhood onset, ophthalmoplegia and migraine headaches. The 3rd cranial nerve is commonly involved in recurrent attacks. Involvement of the sixth and fourth nerves is uncommon. GdMRI discloses enhancement of the nerves. Adult cases are rare and confined to case reports. A viral pathogenesis is considered to be the cause of OM in view of nerve enhancement. We look at the various aspects of OM in children and adults.
Keywords: Adults, children, migraine, ophthalmoplegia
How to cite this article: Lal V. Ophthalmoplegic migraine : Past, present and future. Neurol India 2010;58:15-9 |
» Inroduction | |  |
Ophthalmoplegic migraine (OM), is a unique disorder characterized by recurrent attacks of ophthalmoplegia, following severe migrainous headaches. [1],[2],[3] It was first recognized as such, by Charcot in 1890. [4] The condition almost always begins in childhood, and is considered to be rare in adults. [5],[6] However, OM may occur for the first time in adult life. [7],[8],[9],[10],[11],[12],[13],[14] The typical clinical picture of OM includes a child with severe migraine that lasts for several days and is followed soon after, by ptosis and diplopia due to isolated oculomotor nerve palsy, as the headache remits. Pupillary involvement with a 'full blown' pupil is the rule in children. [3],[15],[16] However, pupillary sparing is not uncommon, especially in adults. [17],[18] Abducens nerve involvement is uncommon [2] and trochlear nerve palsy is rare. [9] Recovery is the rule. Rarely, deficits persist after multiple attacks. [2],[3]
The incidence of OM is about 0.7 per million. [19] In a cohort of 5,000 patients with migraine, Friedman et al. found only eight patients with OM. [20] All the patients had childhood onset with multiple attacks of oculomotor nerve palsy. Lal et al. [18] reported 62 adult patients with OM in a cohort of 7,000 patients with migraine seen in a tertiary care hospital in India. These patients developed acute ophthalmoplegia with severe attacks of migraine. Isolated abducens palsy was seen in 35 (56.5%) patients at presentation thus suggesting that abducens nerve palsy is not as rare as previously reported. [7],[8],[10],[12]
Ophthalmoplegic migraine: The past
The criteria first proposed by Walsh and Hoyt [2] included: a) established history of typical migraine headaches, b) increasing severity of migraine (crescendo migraine) prior to the ophthalmoplegic attack, c) development of recurrent ophthalmoplegia with migraine pain, and d) exclusion of other causes of painful ophthalmoplegia with appropriate investigations, including a normal angiogram. These criteria were incorporated in the 1988 headache classification of the International Headache Society (IHS), and OM was included in the classification as a variant of migraine (1.3). [21] It was reasoned that during a severe migraine attack, the edematous wall of the ipsilateral carotid artery compresses the oculomotor nerve inside the cavernous sinus, besides narrowing the ostia of the vasa nervosa supplying the oculomotor nerve inside the cavernous sinus. [17],[22] Abnormal angiographic findings lent credence to this view. [22] Thus, depending on the presence or absence of pupillary involvement in patients with oculomotor palsy, a compressive [22] or ischemic etiology [17] was suspected.
Ophthalmoplegic migraine: The present
The advent of gadolinium magnetic resonance imaging (GdMRI) studies provided new insights into the pathogenesis of OM and triggered a sea change in the perception of the entity. The initial literature on MRI changes in OM was mostly confined to single case reports. Mark et al. [23] first described reversible enhancement of the third cranial nerve in OM. A year later, in 1993, Stommel et al. [24] reported an 18-year-old male with OM and recurrent right-sided pupil-involving third nerve palsy. GdMRI disclosed thickening and enhancement of the cisternal segment of the third nerve, that resolved on follow-up imaging five weeks later. Straube et al. [25] also reported similar enhancement of the third nerve in a single case of OM. In the first large series of OM in the post-MRI era in 1998, Mark et al. [26] reported six patients with recurrent third nerve palsy associated with thickening and enhancement of the involved nerves on GdMRI. These changes were evident in the cisternal segment of the third nerve and were most pronounced in the exit zone of the nerve from the midbrain. Follow-up GdMRI studies done after the resolution of ophthalmoplegia disclosed almost no enhancement. Based on their observations of the presence of reversible enhancement of the third nerve in OM, [23],[26] and its absence in ischemic diabetic cranial neuropathy, [23] Mark and colleagues [26] postulated a benign viral infection as the possible cause of OM. This view was subsequently endorsed by Lance and Zagami [16] who reported five patients of OM, including a patient with adult onset OM. One of their patients, a child, had recurrent attacks of OM following vaccination on three separate occasions. Based on these observations, and the presence of nerve edema and globoid appearance of the intracisternal part of the oculomotor nerve at the root exit zone the authors suggested that the syndrome might be caused by a recurrent demyelinating neuropathy, in which an inflammatory process affecting the oculomotor nerve might have irritated trigeminal sensory fibers present in the same nerve, triggering migraine headache. They felt that the pronounced thickening and enhancement of the third nerve, at its origin from the midbrain was due to intraneural edema, similar to that seen in inflammatory demyelinating neuropathies. In an accompanying editorial, Daroff [15] also endorsed this view and suggested shifting OM from `migraine' to a `cranial neuralgia' category. Carlow [3] also suggested a similar hypothesis of recurrent demyelination and remyelination leading to intraneural edema and enhancement of the third nerve, at its exit from the brainstem. A plethora of other case reports exhibiting similar findings on imaging, supported a post-viral demyelinating hypothesis. [27],[28],[29],[30],[31],[32]
Based on these incontrovertible GdMRI findings, OM was removed from the migraine group and relegated to the neuralgia group. The revised IHS classification proposed the following criteria for the diagnosis of OM:
- At least two attacks fulfilling criterion B.
- Migraine-like headache accompanied or followed within four days of onset by paresis of one or more of the third, fourth or sixth cranial nerves.
- Parasellar, orbital fissure, and posterior fossa lesions ruled out by appropriate investigations.
Thus, the final exclusion of this jinxed entity [33] from a respectable position of being considered a migraine variant to being relegated to the cranial neuralgia group was solely based on the premise that because ischemic diabetic cranial neuropathy does not enhance, and OM enhances, it cannot be of ischemic origin. [26] Opthalmoplegic migraine was considered akin to post-viral and other demyelinating neuropathies. [15],[16] The severe migrainous headaches seen in almost all cases of OM were considered to be of secondary significance, without any relevance to its pathogenesis. Henceforth, OM was considered to be a post-viral demyelinating inflammatory neuropathy, without any relation to migraine or its pathogenic mechanisms. Besides cases with enhancement, lack of third nerve enhancement on GdMRI is also well documented in the literature. [9],[11],[18],[27],[28],[34],[35],[36] With the exception of a case report by Lee et al., [7] disclosing reversible enhancement of intraparenchymal abducens nerve on MRI, sixth nerve enhancement in OM has not been reported. [8],[10],[12],[13],[18]
In a major break from traditional thinking, we reported 62 adult patients (age 15-68 years) of OM from India. [18] Almost all patients developed ophthalmoplegia during a severe migraine attack. An overwhelming majority of these patients had an antecedent worsening in severity of migraine headaches, before the ophthalmoplegic attack. Whereas 48 patients had a single attack, 14 patients had two or more attacks, fulfilling the IHS criteria for probable and definite OM, respectively. At presentation, isolated abducens, oculomotor and trochlear nerve involvements were seen in 35 (56%), 21 (33%) and five (8%) patients respectively. None of the patients had any nerve enhancement [Figure 1],[Figure 2],[Figure 3],[Figure 4],[Figure 5]. Detailed cerebrospinal fluid (CSF) examination and biochemistry were normal. All patients recovered completely. Use of oral steroids hastened the recovery (P<0.05). From India, Ravishankar and Kartik [36] also reported lack of enhancement in four patients of OM with involvement of third nerve. Borade et al. [37] recently reported a single pediatric case of OM, from Kerala, with enhancement of the third nerve.
On the basis of our series, we suggest the following criteria for the diagnosis of a `pure' case of OM.
- History of established migraine before the first attack of OM. All patients of OM developed against a backdrop of longstanding and uncontrolled migraine.
- History of an antecedent worsening in severity of migraine before the ophthalmoplegic attack. This important fact was also recognized by Walsh and Hoyt. [2]
- Deficits develop during or within 24 h of a severe attack of migraine. The ophthalmoplegic migraine attack is severe and often lasts beyond 24 h, even in children. [1],[21]
- No history of diabetes / hypertension / ischemic heart disease.
- No evidence of vasculitis / active infection / malignancy / recent trauma.
- Normal CSF examination. This has been a universal finding in all patients of OM, even in patients with nerve enhancement.
- Positive family history of migraine.
- GdMRI studies (1.5 Tesla Machine) should a) Disclose normal cavernous sinuses on both sides, b) May show reversible nerve enhancement, c) Not disclose any other pathology that may cause ophthalmoplegia.
- Conventional angiogram / MR angio must be normal in all patients of OM.
- No evidence of any other pathology on follow-up, that may cause ophthalmoplegia.
Ophthalmoplegic Migraine: The future
As things stand today, OM is considered a recurrent inflammatory demyelinating illness of idiopathic or post-viral origin. [1],[5],[16] Migraine is considered secondary to irritation of fibers of the fifth nerve which accompany the inflamed third nerve. [15],[16] GdMRI imaging discloses reversible enhancement of the involved nerves. Resolution of ophthalmoplegia is the rule, with very few cases exhibiting permanent deficits often after recurrent attacks. [2],[3]
Does a post-viral inflammatory hypothesis for OM account for other clinical features of OM? A hard look at the diagnostic criteria of OM is necessary before deciding the answer. Some of the issues include:
- In spite of a postulated post-viral inflammation, a viral prodrome is universally missing in cases of OM, both with and without enhancement. [2],[3],[7],[8],[9],[10],[11],[12],[13],[14],[15],[16],[17],[18],[19],[20],[21],[22],[23],[24],[25],[26],[27],[28]
- The CSF has consistently been normal in all patients of OM, both with and without enhancement. [8],[9],[10],[11],[12],[16],[17],[18],[26],[27],[28] Indeed, CSF was completely normal in four patients with OM reported by Mark et al.[26] all of whom had enhancement.
- Similarly, a post-viral hypothesis cannot account for migraine associated with sixth and fourth nerve involvement.
- A post-viral theory also cannot account for lack of enhancement of nerves.
Contrary to current thinking, migraine may have a definite role in the pathogenesis of OM:
- Literature testifies to the fact that almost all patients of OM develop ophthalmoplegia with severe migraine, irrespective of age, sex, presence or absence of nerve enhancement.
- All patients of OM have a past history of typical migraine, which is similar to the ophthalmoplegic attack.
- There is antecedent increase in severity of migraine headaches prior to the onset of ophthalmoplegia.
- The migraine is invariably ipsilateral to ophthalmoplegia.
- CSF is always normal.
For the above mentioned reasons, we feel that uncontrolled migraine may be the cause of OM. Activation of trigeminovascular system during an attack of migraine releases neuropeptides in the vessel wall. This causes a sterile inflammation of the wall of vasanervosa leading to a breach in the blood nerve barrier, which is formed by endothelium of vasanervosa. This leads to nerve edema and injury. Imaging may or may not show enhancement. There appears to be no difference in migraine headaches in patients with [3],[15],[27],[28] and without enhancement. [34],[38] Once the attack of OM subsides, the decrease in neurogenic inflammation of the vessel wall leads to restoration of the blood nerve barrier and decrease in nerve edema and enhancement. Thus, this hypothesis accounts for all facets of OM including antecedent severe migraine headaches and nerve enhancement. Recurrent attacks may result in nerve infarction and aberrant regeneration.
Are there subtypes of OM?
It would be futile to divide OM into various subtypes as it is a heterogeneous disorder. However, based on our experience [18] and cases reported in world literature, [2],[3], [7],[8],[9],[10],[11],[12],[13],[14],[15],[16],[23],[24],[25],[26],[30],[31],[32],[33],[34],[35] we would like to divide it into the following types:
- Childhood variant: This very well-described variant is characterized by onset in childhood, severe migraine, recurrent third nerve palsy with pupillary involvement, and enhancement on GdMRI. Rarely, it is painless [2] and lacks enhancement. [2],[27],[28],[36]
- The adult variant: It is characterized by adult onset, severe migraine, an antecedent worsening in severity of migraine prior to the ophthalmoplegic attack, and single attacks of sixth nerve palsy. [18] Third nerve involvement is less common and it is pupillary-sparing. Enhancement is uncommon even with third nerve involvement. [5],[9],[11],[34],[35],[36]
» Conclusions | |  |
No complication of migraine has generated so much discussion as OM. Yet, there appears to be no consensus on this issue. Recent publications are eloquent of this discord. [5],[18],[35],[36],[39] In our opinion, reducing migraine to a secondary spectator in the pathogenesis of OM, would be turning a Nelson's eye to the obvious. Its uniform and overwhelmingly severe presence in all cases of OM, irrespective of the type of cranial nerve involvement, cannot be ignored. Socrates said, "I cannot make people learn, I can only make them think". We hope to have succeeded in doing that.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]
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