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A cyclic vertical deviation with dysthyroid ophthalmopathy: a case report
© The Author(s). 2016
Received: 24 November 2015
Accepted: 13 July 2016
Published: 22 July 2016
Cyclic strabismus is a very rare condition of ocular motility characterized by alternating strabismus and orthotropia. We report a patient with a 48-h cycle of vertical deviation associated with dysthyroid ophthalmopathy that spontaneously resolved.
A 40-year-old woman experienced sudden onset vertical double vision. She had already been diagnosed with hyperthyroidism. Asymmetric enlargement of the inferior and medial rectus muscles was demonstrated in her left eye on computed tomography, and was compatible with dysthyroid ophthalmopathy. She clearly described the “every-other-day” pattern of diplopia that spontaneously switched around 8 o’clock every night. She exhibited left hypotropia of 35 prism diopters on a bad day, and 7 prism diopters on a good day.
This case illustrates that cyclic vertical deviation may spontaneously resolve along with the course of the underlying diseases that initiated the cyclic deviation, especially in patients with conditions involving motor component changes such as dysthyroid ophthalmopathy.
Cyclic strabismus is a rare disorder of ocular motility characterized by alternating strabismus and orthotropia. It may occur spontaneously in childhood , in adults, however, it is mostly associated with acquired pathological conditions such as central nervous system lesions, underlying visual deficits, and ocular motility disorders . Almost all of these types of strabismus involve cyclic esotropia, but a few cases of isolated vertical deviation have been reported [3–5]. Many studies have attempted to clarify the pathophysiology of this condition, but the precise mechanisms remain unknown. Disruption of the innate biological clock and involvement of the suprachiasmatic nucleus of the hypothalamus are two proposed mechanisms . A relationship between cyclic vertical deviation and ocular neuromyotonia was recently suggested with similar neurophysiological mechanisms . We herein present a patient with a 48-h cycle of vertical deviation associated with dysthyroid ophthalmopathy that spontaneously resolved.
No mechanism for cyclic strabismus has been determined, although diurnal and circadian rhythms or biological clock mechanisms are assumed to play a role [1, 2, 6]. Diurnal variation and circadian rhythms occur normally. Cyclic deviations associated with acquired pathophysiological conditions can be subdivided into those involving central nervous system lesions (head trauma, high fever, cerebrovascular accidents, severe infection, encephalitis, tumors, or seizures) and those involving peripheral lesions. Peripheral lesions can be differentiated into those involving primarily motoric changes in peripheral structures (e.g., squint surgery or ocular myositis), and those involving sensory disturbances (e.g., visual loss or lens loss) .
In the present case, enlargement of the extraocular muscles associated with dysthyroid ophthalmopathy resulted in disruption of binocular fusion, which may have acted as a trigger event for the onset of the cyclic vertical deviation. Interestingly, the patient’s deviation was initiated and became aggravated with the onset of active dysthyroid ophthalmopathy. During the follow-up period, it decreased and subsided along with spontaneous remission of her thyroid eye disease and normalization of her thyroid hormonal level without any medical or surgical management. Roper-Hall et al. reported that cyclic vertical deviation could be a possible forme fruste of ocular neuromyotonia with similar neurophysiological mechanisms . Ocular neuromyotonia is characterized by brief involuntary episodic contractions of ocular muscles, with a sustained tonic contraction, with episodes lasting from seconds to 3–4 min . Cyclic vertical deviation has similar clinical characteristics to ocular neuromyotonia except that the sustained strabismic phase lasts for 24 h on an alternate day cycle . The patient had a spontaneously switching “every-other-day” pattern of diplopia, compatible with cyclic strabismus. Further studies with more cases are needed to confirm cyclic vertical deviations as a variant form of ocular neuromyotonia and to investigate treatment efficacy with membrane stabilizing agents to control abnormal muscle spasms.
The occurrence of cyclic vertical deviation associated with dysthyroid ophthalmopathy has been reported in four adults since the first description by Knapp in 1979 . All patients were treated by recession of the inferior rectus muscle. Based on the hypothesis that cyclic deviation is a strabismic condition with a “burst of orthophoria”, surgical treatment of the full amount of heterotropia on “strabismic” days has been tried. This treatment successfully terminates the cycle without overcorrection on “non-strabismic” days in most patients [3–5]. However, surgical treatment for cyclic strabismus should be considered carefully after a long follow-up [4, 9]. Our findings provide additional evidence that cyclic vertical deviation may spontaneously resolve, along with the course of the underlying diseases that initiated the cyclic deviation, especially in patients with conditions involving motor component changes such as dysthyroid ophthalmopathy.
CAS, clinical activity score; CT, computed tomography; FDT, forced duction test; PD, prism diopters.
The authors would like to thank all staff involved in the care of patient presented in this case report.
No funding was received by any of the authors for the writing of this manuscript.
Availability of data and materials
All data supporting the findings is contained within the manuscript.
JSP drafted the manuscript and performed the literature review. SWY participated in information gathering and editing. SHP conceived the idea, managed the patient’s ophthalmic conditions and supervised writing of this case report. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the consent is available for review by the Editor of this journal.
Ethics and consent to participate
This case report was approved by the Institutional Review Board of Seoul St. Mary’s Hospital and the tenets of the Declaration of Helsinki.
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