Vascular territories and clinical Syndromes of the Posterior Circulation
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1 Joint Annual Meeting SNG SSN Basel, October 10 th, 2012 Vascular territories and clinical Syndromes of the Posterior Circulation PD Dr Patrik Michel Neurology Service, CHUV Unité Cérébrovasculaire
2 Posterior circulation strokes are suggested by the acute 1. Vestibular symptoms 2. Visual symptoms 3. Bilateral or crossed manifestations 4. Decreased level of consciousness at onset 5. Amnesic syndromes
3 1. Vestibulo-ocular manifestations of posterior circulation strokes Vertigo & nystagmus Vertical diplopia Ocular tilt reaction Skew deviation Visual tilt
4 checklist Is the vertigo due to stroke? Consider Acute spontaneous onset vertigo/imbalance Patient cannot walk anymore, even with help Acute associated acute hearing loss ( AICA) New or unusual headache Patients with vascular risk factors, elderly, cardiac sources Other central symptoms (patient) or signs (witness) Hiccup, dysarthria, new Horner, mild long tract sign, etc. On examination: Normal head thrust (Halmagyi) and cold calorics despite persistent vertigo «Central» type nystagmus (see next slide)
5 checklist Is the nystagmus due to stroke? A nystagmus is in general central if it is Multidirectional gaze-evoked Vertical Pendular, convergence-retraction Dissociated Not accompanied by vertigo/nausea Not improved by visual fixation Not useful to differentiate central from peripheral : Conjugate horizontal or rotatory nystagmus Positional or not (exception: short, stereotyped in BPPV) Transitory or persistent
6 Nystagmus due to stroke Examination localisation Midbrain Convergence-retraction Disconjugate (INO) Rotatory (torsional) Pons Disconjugate (INO) (Bobbing) Medulla oblongata May imitate peripheral-type Cerebellum May imitate peripheral-type Multidirectional gaze-evoked Midbrain Pons Medulla
7 Vertical diplopia of central origin Examination and localisation Central paresis of elevation/depression of one eye Unilateral midbrain (fascicle of III) Acquired vertical strabism = skew deviation May be of central or peripheral origin Precise localisation: see next slide
8 Vertical diplopia in skew deviation Where is the lesion? Hemispheres Midbrain Pons Elevation one eye Depression other eye Medulla
9 Vertical diplopia Example : skew deviation
10 Ocular tilt reaction (OTR) Consists of 1. Skew deviation 2. Head lateroflexion 3. Ocular torsion (all to the same side) May be associated with visual tilt (of the image)
11 OTR and subjective visual vertical Example Right lateral medullary stroke (Wallenberg) From right vertebral artery occlusion
12 2. Visual manifestations of posterior circulation strokes Vertical diplopia and gaze paresis Horizontal diplopia Conjugate horizontal eye deviation /gaze paresis («Wrong way») Ptosis Homonymous visual field deficits
13 Vertical gaze paresis, vertical diplopia Central localisations and causes Vertical gaze paresis: up- and / or downgaze Uni- or bilateral midbrain (+/- lower thalamus) Vertical diplopia (see previous slided) Vertical paresis of one eye ( central III) Or vertical strabism = skew deviation
14 Vertical gaze paresis Example Up- and downgaze paresis bilateral midbrain + lower thalamus stroke
15 Horizontal diplopia of central origin Examination and localisation Abduction: fascicular VI pons Abduction: «pseudo-vi» (hyperconvergence) dorsal midbrain Adduction: INO (internuclear ophtalmoplegia ) dorsal pons/midbrain Right fascicular VI
16 Conjugate horizontal eye deviation Central lesions: localisation and causes Ipsilateral («Patient looks at his lesion») Hemispheres Contralateral («Patient looks at his hemi- paresis») («Wrong-way eye devation») Ipsilateral («Patient looks at his lesion») Midbrain Pons Medulla
17 Stroke and unilateral ptosis Examination and localisation Hemispheres As part of a central syndrome ( miosis!) ipsilateral dorsally between hypothalamus and Th 1 Midbrain Pons Medulla Central right Horner As part of a IIIrd nucleus or fascicle lesion dorsal midbrain Right IIIrd palsy
18 Stroke and bilateral ptosis Examination and localisation Uni- or bilateral lesion of the III rd nucleus dorsal midbrain Levator palpebrae receives fibers from both IIIrd nuclei Supratentorial «eye opening apraxia» large right hemispheric lesions Radiology CHUV
19 3. Bilateral manifestations in posterior circulation strokes «Syndrome alterne» Cranial nerve deficit ipsilateral Long tract signs contralateral Bilateral corticospinal signs and ataxia Basilar artery supplies both sides Paramedian lesions are often bilateral Anterior pons: crossings of cerebellar fibers Basilar artery Posterior Lateral Anterior
20 Basilar artery occlusion Causes, syndromes and arterial pathology are heterogeneous: Proximal: Wallenberg +/- cerebellar +/- medial medullary sdr. (bilateral) vertebral artery disease Mid-basilar: locked-in syndrome local atherosclerosis or embolic Distal : top of basilar syndrome embolic from proximal source or cardiac About 50% of patients have precursory symptoms or a progressive onset Overall prognosis is poor BASICS-investigators, Lancet Neurology 2009
21 4. Decreased level of consciousness in posterior circulation strokes Lesion localisation Mesencephalon +/- thalamus Usually bilateral, dorsal (tegmentum, RAS) Beware : «pseudo stupor» in posterior stroke Locked-in syndrome (anterior pons): consciousness preserved Bilateral ptosis may occur without decrease of consciousness
22 5. Amnesia in posterior circulation stroke Anterior cerebral artery Anterior choroidal artery Anterior communicating artery Posterior cerebral artery Posterior choroidal artery Posterior communicating artery Fornix NA NDM Thalamus Thalamus: - NA anterior nuclei - NDM dorsomedial nuclei Basal forebrain Mammillothalamic tract Mammillary body HIPPO - CAMPUS PARA HIPPOCAMPAL GYRUS Slide: courtesy J. Ferro, Lisbon
23 5. Amnesia in posterior circulation stroke The limbic mnestic system (Papez is mainly supplied by the posterior circulation Main lesion localisations: Anterior thalamus (posterior comm. art.) Medio-temporal lobe (PCA) Unilateral lesion: transient confusional/ amnestic state Bilateral lesions: persistent amnestic state Anterior thalamic Radiology CHUV
24 Typical posterior circulation syndromes Medulla oblongata Pons Mesencephalon Cerebellum Thalamus / PCA
25 Brainstem and cerebellum: arterial supply Paramedian arteries Short circumferential art. Long circumferential art. Cerebellar arteries -> Cerebellum -> Posterieur brainstem -> (Lateral trunc) Cerebellum Posterior Lateral Anterior: - antérolateral - anteromedial Tatu 1996, Foix 1925 B Drawing: Caplan, Goodwin 1982
26 Lateral medullary syndrome syndrome Vertigo, conjugate contralateral horizontal and/or rotatory nystagmus, contralateral eye deviation Ocular tilt reaction (OTR), Ipsilateral hemiataxia IX, X: dysphagia, hoarseness, hiccup V (ipsi- and/or contra-lateal) Sensory hemisyndrome (mostly spinothalamic contralat.) Arteries responsible: 1. Circumferential arteries (perforators) 2. PICA-branches (Beware: cerebellar involvement cannot be evaluated clinically)
27 Lateral medullary syndrome PICA Medial vestibular nucleus NTS Trigeminal nucleus and fascicle Cerebellar peduncle Spinothalamic tract Circumferential perforators Vertebral artery Radiology CHUV
28 Medial medullary syndrome Typically Contralateral hemiparesis (arm, leg) Contralateral posterior-column sensations loss (arm, leg) Ipsilateral XII Other manifestations Hemiparesis may be ipsilateral, or bilateral (depending on lesion site within pyramid) Combination with symptoms of Arteries responsible: 1. Perforator occlusions (coming from the vertebral artery) 2. Vertebral artery occlusion
29 Pontine syndromes p.ex. : Foville syndrome (paramedian antero-posterior) Ipsilateral nuclear VII Ipsilateral gaze paresis (PPRF and/or nucleus VI) Contralateral hemiparesis Other manifestations of pontine strokes INO, ipsilateral V or VI Hemiataxia (ipsi- and/or contralateral), OTR Contralateral hemisensory loss (any modality) Arteries responsible: 1. Paramedian and circumferential arteries (perforators) 2. AICA-branches
30 Pontine syndromes Example: paramedian perforators (Foville) Facial nucleus and fascicle Abducens nucleus Corticospinal fibers Radiology CHUV
31 Midbrain syndromes p.ex. : syndrome (paramedian midbrain) Ipsilateral III Contralateral hemiparesis Other manifestations of midbrain strokes Convergence-retraction nystagmus Temor, myoclonus, chorea Contralateral hemiataxia, dysarthria (cerebellar SCA territory) Contralateral hemiparesis (pedoncule) Contralateral spinothalamic sensory los Arteries responsible: 1. Paramedian and circumferential arteries (perforators) 2. SCA-branches 3. PCA-branches Right III palsy Left hemiparesis
32 Midbrain syndromes Example: paramedian perforators () Oculomotor nucleus and fascicle Corticospinal fibers (Cerebral peduncle)
33 Thalamic stroke syndromes 4 classical territoires Internal carotid Post. communic. Thalamogeniculate artery Polar artery (sometimes from*) Thalamicsubthalamic artery paramedian art. PCA Posterior choroidal artery * Illustration: Barth et al, In: Bogousslavky&Caplan, Stroke Syndromes 1999
34 Thalamus : the great imitator Artery Thalamo-geniculate artery Thalamic territory Signs Lateral Sensory hemisyndrome Hemiataxia, pain Hemidystonia Polar artery Anterior Abulia, confusion L: aphasia, verbal amnesia R: visual amnesia Thalamicsubthalamic art. paramedian art. Posterior choroidal artery Paramedian Pulvinar, lateral corpus geniculatum Vigilance, amnesia, vertical gaze paresis Dystonia, asterixis Visual field defects (Amnesia, aphasia, dystonia, hemisyndrome)
35 Cerebellar strokes Cerebellar arterial supply SCA AICA PICA
36 Cerebellar strokes They may all have hemi-ataxia and gait ataxia Cerebellar artery Superior (SCA) Antero-inferior (AICA) Postero-inferior (PICA) Purely cerebellar territory Dysarthria Rotatory vertigo Rotatory vertigo Plus adjacent brainstem territory IV, contralateral spinothalamic signs Chorea, ipsilateral Horner Hypoaccousie/tinnitus VII, V, ipsilateral Horner Contralateral spinothalamic signs
37 Posterior cerebral artery stroke 3 territories Mesencephalo-thalamic territory See previous slides Occipital territory Homonymous visual field deficits Medio-temporal territory Left: (transient) verbal amnesia, alexia, visual agnosia, color anomia Right: (transient) visual amnesia, color agnosia Bilateral (or right acute): prosopagnosia
38 T H E E N D Unité Cérébrovasculaire patrik.michel@chuv.ch
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