Pontine warning syndrome and restless legs syndrome secondary to paramedian pontine infarction: a case report.

Pontine warning syndrome (PWS) occurs rarely and is characterized by recurrent, stereotyped episodes of motor or sensory dysfunction, dysarthria, or ophthalmoplegia leading to pontine infarction. Restless legs syndrome (RLS) is a distinct neurological sensorimotor disorder. Pontine infarction is a rare but possible cause of RLS. Here, we report the case of a 58-year-old woman who experienced unilateral RLS in concomitance with stereotyped episodes of left-sided weakness and dysarthria, and developed an acute paramedian pontine infarction eventually. To the best of our knowledge, no other cases of PWS coinciding with RLS in the progression of pontine infarction have been reported in the literature. Furthermore, we discussed the potential mechanisms of PWS and RLS secondary to pontine infarction, which may be helpful for managing such patients.

Stroke warning syndrome.

Stroke Warning Syndrome (SWS) is a form of early recurrent transient ischemic attack (TIA) which carries a high risk of infarction. It is characterized by repeated stereotypical sensorimotor symptoms affecting the face, arm, and leg without associated cortical involvement occurring within a seven-day period after an index TIA. In this systematic review, we identified that 1.5-4.5% of TIAs present as SWS and despite this occurrence, little is known about management strategies and treatment outcomes. Various mechanisms including small vessel disease, artery to artery embolism, hemodynamic instability and periinfarct depolarization may account for its nature. There are no specific guidelines on treatment, but thrombolysis appears safe but does not necessarily provide an advantage over antiplatelet and/or anticoagulation in preventing recurrences. Regardless of treatment, SWS is associated with excellent clinical outcomes.

Vascular pattern and radiological follow up in a case of pontine warning syndrome.

Pontine warning syndrome (PWS) is a condition characterized by crescendo transient ischemic attacks due to pontine ischemia. The reported case described a 72-year-old woman who presented repetitive sudden episodes of double vision, impaired balance, slurred speech and right-sided weakness. Neurological deficits lasted a few minutes-hours and disappeared during the first seven days after onset. On the 1st day, MRI revealed acute left paramedian pontine infarction with focal swelling. Supra-aortic vessel imagining revealed bilateral internal carotid stenosis of 50%; hypoplasia of the left vertebral artery. On the 7th day, MRI showed a tissue swelling reduction, and from that day, she had no symptoms. These clinical and radiological features were suggestive of PWS. Our patient presented a particular vascular pattern that could favour symptoms fluctuation. We performed a close MRI follow up and it allowed us to observe a clinical stabilization in association with edema reduction.

Stroke warning syndromes.

It is important for physicians to be aware of stroke warning syndromes because, although rare, there is a high associated risk of subsequent ischaemic infarction. Stroke warning syndromes present as stereotypical, recurrent transient episodes of focal neurological deficit, in the absence of cortical signs, occurring within a short period of time. They are broadly divided into two main subtypes, based on vascular territory: capsular warning syndrome and pontine warning syndrome. The exact underlying pathophysiology related to stroke warning syndromes is incompletely established, but proposed pathophysiological hypotheses for cerebral hypoperfusion include micro-atherosclerosis (cerebral small vessel disease) and haemodynamic instability (e.g. hypotension). Atherosclerotic disease involving small perforating arteries in the anterior circulation (e.g. lenticulostriatal arteries) gives rise to capsular warning syndrome and subsequent risk of capsular infarcts. Conversely, involvement of the posterior circulation pontine perforator arteries gives rise to pontine warning syndrome, which can result in paramedian pontine infarcts. Although the evidence is limited, recommended treatment modalities include permissive hypertension, intravenous recombinant tissue plasminogen activator, dual antiplatelet therapy and statins.

Fluctuating locked-in syndrome as a presentation of a bilateral pontine infarction.

The "pontine warning syndrome" is characterized by recurrent episodes of motor hemiparesis, dysarthria and horizontal gaze palsy associated with basilar artery branch infarction. We report a case of a patient who presented with recurrent, self-limited episodes of locked-in syndrome, related to a bilateral pontine infarction. As far as we know, this clinical presentation as a subtype of pontine warning syndrome has never been described. We discuss the case, the differential diagnosis of the neuroimaging and the possible underlying mechanism.

Stroke warning syndrome: 18 new cases.

BACKGROUND: Stroke warning syndrome (SWS) is a rare cause of stroke characterized by recurrent and short-lasting episodes of transient focal neurological deficits leading up to infarction. On the basis of clinical findings and neuroimaging, it can be capsular, pontine, or callosal. The aim of this study is to evaluate the prevalence of SWS in patients admitted to our Stroke Unit for an ischemic stroke and to look for the difference in outcome between patients treated or not with systemic thrombolysis by intravenous recombinant tissue plasminogen activator (IV-rtPA). METHODS: Among the 967 patients admitted to our Stroke Unit between April 2008 and January 2013 for ischemic stroke, we identified 18 patients with SWS. Nine patients underwent IV-rtPA (IV Group) and the other 9 (No IV Group) other therapies. RESULTS: The prevalence of SWS in our population was 1.8%. The most common risk factors were hypertension and dyslipidemia in both groups. A good outcome at 3-month follow-up (modified Rankin Scale 0-2) was found in 3 patients (33%) in IV Group and in 5 patients (55%) in No IV Group. CONCLUSION: SWS is an under-recognized syndrome. Intravenous rt-PA treatment seems to have lower efficacy than in other subtypes of strokes, but none of the patients with SWS undergoing treatment presented haemorrhagic transformation or other complications.