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Paroxysmal dystonia as the first manifestation of multiple sclerosis with internal capsular plaque/Multipl sklerozda ilk belirti olarak internal kapsuler plaga bagli paroksismal distoni.

Dear Editor,

Dystonia is an involuntary movement, mostly due to repetitive, long lasting twisting muscle contractions, causing abnormal postural changes in body, or parts of body (1). Dystonia can be differently named as continual or paroxysmal depending on contraction duration, or focal, segmental, multi-focal, generalized or hemi-dystonic, according to the affected body location (2). Idiopathic paroxysmal dystonia can be subcategorized as kinesigenic, non-kinesigenic, hypnogenic, and the exercise-induced forms (3).

Here, we report the case of a 40-year-old male with episodes of paroxysmal non-kinesigenic dystonia (PNKD) as the first manifestation of multiple sclerosis (MS), secondary to an acute demyelinating lesion in the left posterior limb of the internal capsule detected by magnetic resonance imaging (MRI). PNKD was localized on the right arm and limb region, with symptoms started in the previous week (Figure 1). The episodes of dystonia lasted 5-30 seconds and repeated 4-7 times a day. He had no family history of any movement or other neurological disorders. He was not using anti-emetics, antipsychotics or any other medications. Except for PNKD, the physical and neurological examinations were normal. Laboratory tests, including blood chemistry and both rheumatologic and immunologic screening tests, were normal. MRI of the brain revealed multiple periventricular hyperintensities on T2-weighted images. There was also an axial-coronal T1-weighted image with contrast showing enhancement of a nodular hyperintense active MS plaque in the left posterior limb of the internal capsule (Figure 2). No lesions were observed in the basal ganglia or thalamus. The patient was diagnosed as having MS according to the new McDonald's criteria (2010 revision). These episodes disappeared with high-dose methylprednisolone (1 g/ day for 5 days) treatment.

Paroxysmal dystonia is rarely observed in patients with MS and its pathogenesis remains unknown. Several mechanisms have been suggested by Transcranial Magnetic Stimulation studies for dystonia, including transversely spreading ephactic activation originating the axon within the partially demyelinated lesion at any level of motor fiber tracts, and axonal irritability secondary to releasing of inflammatory mediators (4,5).

Acquired paroxysmal dystonia is frequently seen in the lesions involving the basal ganglia, extrapyramidal tract system, or thalamus. Other than typical localizations, sporadic cases exist involving demyelinated plaques in the cervical spinal cord, midbrain, medulla, internal capsule, and cerebral peduncle, even cases of MS not explainable by anatomical evidence have been reported (6,7).

This paper suggests that in patients with acute paroxysmal dystonia, neuroimaging is often useful in excluding structural lesions. This case, therefore, illustrates the need to consider MS in the differential diagnosis of all paroxysmal dystonias, particularly in those with abrupt onset, even in the absence of any other neurological abnormality. Nevertheless, explaining the underlying pathophysiological mechanism is not trivial for the limited dystonia in the right arm and leg of our case.

Doi: 10.4274/npa.y7515

References

(1.) Tarsy D, Simon DK. Dystonia. NEJM 2006; 355:818-827.

(2.) Mehanna R, Jankovic J. Movement disorders in multiple sclerosis and other demyelinating diseases. J Neurol Sci 2013; 328:1-8.

(3.) Dressler D, Benecke R. Diagnosis and management of acute movement disorders. J Neurol 2005; 252:1299-1306.

(4.) Usmani N, Bedi G, Lam BL, Sheremata WA. Association between paroxysmal tonic spasms and neuromyelitis optica. Arch Neurol 2012; 69:121-124.

(5.) Trompetto C, Avanzino L, Bove M, Buccolieri A, Uccelli A, Abbruzzese G. Investigation of paroxysmal dystonia in a patient with multiple sclerosis: a transcranial magnetic stimulation study. Clin Neurophysiol 2008; 119:63-70.

(6.) Hsieh PC, Chen SM, Guo YH, Kuan TS, Yen WJ, Chang WC, Lin YC. Effect of acetazolamide for long-lasting paroxysmal dystonia in a patient with multiple sclerosis: a case report and review of literature. Neuropsychiatr Dis Treat 2013; 9:445-448.

(7.) Rajabally YA, Farrell D, Messios N. Oro-mandibular dystonia in a case of multiple sclerosis with capsular plaque. Eur Neurol. 2003;49:190-191.

Ali Ulvi UCA, Mustafa ALTAS

Necmettin Erbakan University Meram Faculty of Medicine, Department of Neurology, Konya, Turkey

Correspondence Address/Yazisma Adresi

Ali Ulvi Uca MD, Necmettin Erbakan University Meram Faculty of Medicine, Department of Neurology, Konya, Turkey Gsm: +90 505 576 25 44 E-mail: aulviuca@hotmail.com Received/Gelis tarihi: 18.11.2013 Accepted/Kabul tarihi: 16.12.2013
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Article Details
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Title Annotation:Letter to the Editor/Editore Mektup
Author:Uca, Ali Ulvi; Altas, Mustafa
Publication:Archives of Neuropsychiatry
Article Type:Letter to the editor
Geographic Code:7TURK
Date:Sep 1, 2014
Words:684
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