CHOREA CAUSED BY UNRUPTURED ARTERIOVENOUS MALFORMATION: CASE REPORT AND REVIEW OF LITERATURE.
Chorea is a movement disorder characterized by involuntary, purposeless, rapid movements of the limbs, trunk, neck and face. Chorea affecting one side of the body is called hemichorea. Different causes, including genetic, metabolic, pharmacological and structural, can lead to disturbances in basal ganglia, which leads to the loss of inhibition in subthalamic nucleus resulting in involuntary movements (1-4). Huntington's disease, an autosomal dominant neurodegenerative disorder, is the best known cause of chorea. Chorea as a symptom may occur as part of Wilson's disease, benign hereditary chorea, neuroacanthocytosis, and some other inherited diseases (3,5). Autoimmune disorders including systemic lupus erythematosus, Sjogren's syndrome and antiphospholipid syndrome may have chorea in their clinical presentation (6-9). Sydenham's chorea occurs as a result of cross-reaction of antistreptococcal antibodies with basal ganglia neurons (10). While some causes of chorea may manifest as hemichorea, it is still more often a result of certain processes localized in contralateral basal ganglia. Hemichorea may occur in patients with nonketotic hyperglycemia, and can also be part of the paraneoplastic syndrome (3).
Arteriovenous malformations (AVM) of the brain are rare vascular malformations that are supposed to be of congenital origin (11). Their angioarchitecture is complex and includes arterial feeders, a net of dysplastic vessels, so-called nidus and draining veins (12). Clinical presentation of AVM depends on hemodynamic characteristics and topography of the malformation (13).
We report a case of a female patient with an AVM in the temporal lobe who presented with hemichorea.
A 64-year-old female patient came with choreic movements that she had noticed one month before she was admitted to the hospital. In addition, she noticed handedness of the left arm and temporary episodes of numbness of the left arm and left side of the face. Occasionally, she observed tics of the left half of the face. In the past medical history, for more than thirty years she had asserted temporary occipital headaches accompanied with nausea and urge to vomit. Her neurological status was predominated by choreiform movements, along with discrete weakness of the left hand, atypical left plantar response, and dysmetria of the left hand. Tandem gait was poor. Laboratory tests showed elevated levels of cholesterol and triglycerides, while other parameters, including glucose, were within the reference values. Ultrasound examination of vertebral arteries showed mild stenosis of both internal carotid arteries. Multislice computed tomography of the brain did not show any acute focal lesions, while magnetic resonance imaging (MRI) of the brain revealed a pronounced tangle of punctiform tubular lesions of the flow void type, in the sense of tangle of small blood vessels, in the medial temporal lobe, the amygdala, and the right uncus. For objective evaluation of the described lesion, we performed digital subtraction angiography (DSA), which showed a plexiform arteriovenous malformation (AVM) in the right temporal lobe with numerous feeding arteries running from the lateral thalamostriatal perforators, as well as from both trunks of the insular segment of the right middle cerebral artery (M2) (Fig. 1). Over two wide, varicose drainage veins, malformation drained to Galen's vein and to the compound of the right transverse and sigmoid sinus. Angiography of the left vertebral artery showed a malformation probably situated just over the right posterior communicating artery. The patient was referred to treatment with embolization and 'gamma knife' method.
Review of Literature
The most common inherited cause of chorea is Huntington's disease, caused by abnormal expansion of CAG trinucleotide on chromosome 4p16. Although it usually occurs in middle age, Huntington's disease may occur in the seventh or eighth decade of life as a result of the small number of CAG trinucleotide repeats. In these cases, family history may be negative, either because of misdiagnosis, or because the carrier of the mutant gene had died before the onset of symptoms (3,14). Vascular insult is the most common sporadic cause of chorea (15). The incidence of chorea following stroke ranges from 0.5% to 1.3% (15,16).
Although movement disorders occur frequently in neurological practice, they are rarely the result of AVM. Lobo-Antunes et al. have described two patients with tremor and dystonia caused by AVM in the contralateral basal ganglia, thalamus and mesencephalon, one patient with torticollis and AVM in the posterior thalamus, and another one with retrocollis and AVM in the parietal lobe. In two patients, the presence of AVM was detected just after its rupture and subsequent subarachnoid hemorrhage. Selective embolization was performed in one patient with tremor, but without clinical improvement (17). Krauss et al. report on six patients, of which one had hemidystonia caused by AVM in the contralateral frontoparietal lobe. Two patients had unilateral tremor associated with AVM in the contralateral frontal lobe. One patient developed hemidystonia and hemichorea-hemiballism after bleeding of temporo-occipital AVM, and two patients had focal hemidystonia caused by hemorrhage from AVM in the basal ganglia. Five patients were operated on and the movement disorder resolved in one of them (18).
In the available literature, different movement disorders are reported as a result of AVM, either ruptured or not, while hemichorea is reported once as a result of ruptured AVM. In our case, hemichorea occurred as a result of unruptured AVM in the medial part of the temporal lobe, which makes this case unique.
Hemichorea can be caused by a large range of degenerative, vascular, metabolic and toxic disturbances in the contralateral basal ganglia (19,20). Among these, acute vascular incident is the most common cause (21). The pathophysiological mechanism leading to hemichorea is complex and not yet completely understood. According to the widely accepted hypothesis, hyperkinetic movement disorders occur due to the loss of subthalamic nucleus control on the internal segment of the globus pallidus (GPi), which leads to disinhibition of the thalamus. Furthermore, decreased striatal inhibitory activity on the external part of the globus pallidus (GPe) results in increased inhibitory activity of the GPe, which in turn results in overinhibition of the subthalamic nucleus leading to hypoactivity of the GPi. This decreased inhibitory activity from basal ganglia neurons leads to unrestrained thalamocortical drive and the appearance of dyskinesias (22-24).
Arteriovenous malformations most commonly present with intracranial hemorrhage, epilepsy, headache, or focal neurologic deficits (25). Intracranial hemorrhage is the most common clinical presentation of AVM (53%) (26). Annual risk of hemorrhage is estimated to 2%-4%, and the risk of re-rupture is increased to up to 18% in the first year after initial bleeding (27,28). Epilepsy is the first clinical manifestation of AVM in 16%-53% of cases (29). In the majority of these cases, seizures are focal, while generalized seizures occur in 30% of cases (30). Chronic headache occurs in 7%-48% of patients with AVM (29). According to a survey conducted in 1999 by the Arteriovenous Malformation Study Group, no headache characteristics such as frequency, duration and severity can indicate the presence of AVM (31). Focal neurologic deficit is the rarest clinical presentation of AVM. According to a study that included 1289 patients with brain AVM, reversible focal neurologic deficits were present in 8%, persistent neurologic deficits in 7%, and progressive neurologic deficits in 5% of patients (26).
Although AVM is assumed to be of congenital origin, most of them are clinically presented later in life. The mean age at clinical presentation is in the third or fourth decade of life, with equal sex distribution (13,32). AVM may become symptomatic by several different mechanisms. The first one is hemorrhage, which may be subarachnoid, intraventricular, or in the brain parenchyma. Secondly, the size of AVM may be such as to exert pressure upon certain parts of the brain (mass effect). Finally, a large volume of blood shunted through the AVM may result in so-called 'steal phenomenon' that leads to temporary or permanent ischemia of neuronal structures (17,18,32). The concept of 'steal phenomenon' has been recently challenged (29). Although most AVM are diagnosed after the onset of acute hemorrhage, epilepsy or focal neurologic deficit, a growing number of AVM are found accidentally on imaging investigations prescribed for other reasons (26,33). Computed tomography and MRI are used in diagnosing AVM, but definitive diagnosis is based on DSA, which provides most information on the angioarchitecture and hemodynamics malformations.
Certain characteristics of AVM are associated with an increased risk of hemorrhage, i.e. deep venous drainage, presence of aneurysm in the nidus or in the arterial feeder, and deep localization of AVM (25,34). Other studies found no positive correlation of these factors with an increased risk of hemorrhage (35), but most studies showed the risk of hemorrhage to increase with age, growing by about one-third with all decades of life (34,35).
Arteriovenous malformations are classified according to Spetzler-Martin's classification in six grades. This classification considers the size of the malformation, the proximity of the functional centers in the brain, so-called eloquent areas of the brain, and the type of venous drainage (36). Also, this classification is widely used for the choice of therapy and to predict the outcome of certain therapeutic procedures. Grade VI represents inoperable AVM (36). Considering therapeutic outcomes of certain grades of AVM, in 2011 Spetzler and Ponce reclassified Spetzler-Martin classification into three groups: low surgical risk for grades I and II, intermediate surgical risk for grade III, and high risk for grades IV and V (37).
There are several treatment options for AVM, i.e. neurosurgical operations, stereotactic radiotherapy, and endovascular embolization (38). Today, surgical management is recommended for grades I and II (39), multi-modality treatment for grade III, and observation is usually recommended for grades IV and V, except for patients with recurrent hemorrhage, progressive neurologic deficit, or medically intractable seizures caused by the AVM (40). In patients with contraindications for surgery, stereotactic radiotherapy may be an effective way of treatment of AVM (41). Unlike the immediate efficacy of surgery, the results of stereotactic radiotherapy evolve over several years, during which the risk of hemorrhage persists, and the risk of adverse effects of radiation on the surrounding tissue should also be assessed. Endovascular embolization is most commonly used as adjunctive therapy in the treatment of AVM, mainly to facilitate or make surgery or radiotherapy safer. To achieve desirable outcome of treatment of AVM, it is necessary to estimate the risk of an event due to the natural course of the disease against the risk of a particular therapeutic option (38).
The case presented shows that a relatively common symptomatology such as movement disorder in the background may have a rare cause such as AVM. Careful medical history and examination with neuroradio-logical imaging are the key to successful diagnosis. In such cases, an interdisciplinary team of neurologists, neurosurgeons and neuroradiologists is required to make the best decision on the therapeutic choice that will have a favorable outcome for the patient.
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KOREA UZROKOVANA ARTERIOVENSKOM MALFORMACIJOM: PRIKAZ SLUCAJA I PREGLED LITERATURE
P. Jurinovic, E. Jadrijevic, A. Repic-Bulicici M. Titlic
Korea je poremecaj pokreta koji moze biti uzrokovan velikim rasponom degenerativnih, vaskularnih, metabolickih i toksicnih poremecaja u bazalnim ganglijima. Arteriovenske malformacije su rijetke vaskularne malformacije klinicka prezentacija kojih ovisi o karakteristikama i lokalizaciji malformacije. Najcesce se prezentiraju intrakranijskom hemoragijom, a najrjede fokalnim neuroloskim deficitom. Prikazujemo slucaj 64-godisnje bolesnice koja se prezentirala hemikoreom. Ucinjena magnetska rezonanca i digitalna subtrakcijska angiografija otkrila je prisutnost arteriovenske malformacije u medijalnom dijelu desnog temporalnog reznja.
Kljucne rijeci: Korea; Pokretljivost, poremecaji; Bazalni gangliji, bolesti; Arteriovenske malformacije; Intrakranijska krvarenja; Prikazi slucaja
Pavao Jurinovic, Eni Jadrijevic, Ana Repic-Bulicic and Marina Titlic
Clinical Department of Neurology, Split University Hospital Center, Split, Croatia
Correspondence to: Eni Jadrijevic, MD, Clinical Department of Neurology, Split University Hospital Center, Spinciceva 1, HR-21000 Split, Croatia E-mail: email@example.com
Received July 6, 2015, accepted October 6, 2015
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|Title Annotation:||Case Report|
|Author:||Jurinovic, Pavao; Jadrijevic, Eni; Repic-Bulicic, Ana; Titlic, Marina|
|Publication:||Acta Clinica Croatica|
|Article Type:||Case study|
|Date:||Sep 1, 2017|
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