MOYAMOYA disease-two case reports

Combined medical therapy and neurosurgical revascularization preventing stroke in post-varicella angiopathy: Case report and review of literature

BACKGROUND

Post varicella angiopathy (PVA) is an underdiagnosed but potentially severe disease in both pediatric and adult settings. No guidelines are available for the medical and neurosurgical management of this condition. We report the first pediatric case with headache and PVA who was treated with surgical revascularization before the onset of ischemic events.

METHODS

This case report was conducted via retrospective chart review. A literature review was also completed, in order to identify previously described PVA undergone to revascularization.

RESULTS

We report on a 9-year-old boy presenting with a long history of headache and PVA involving the distal left middle cerebral artery. The arterial lesion rapidly worsened over a 10 months' period with formation of focal moyamoya-like collaterals, despite an adequate intravenous antiviral treatment. The pattern of headaches significantly changed with a clear left-side lateralization and a "re-build-up" phenomenon on EEG. The patient was treated with left superficial temporal artery - middle cerebral artery (STA-MCA) bypass and encephalo-duro-arterio-myo-pericranial-synangiosis. This combined treatment resulted in an immediate and persistent improvement of brain perfusion, accompanied by prompt resolution of neurological symptoms. Two cases who presented with Suzuki stage III (unilateral or bilateral) moyamoya PVA and recurrent strokes or transient ischemic attacks despite adequate pharmacological prophylaxis have been surgically treated using both indirect and direct revascularization technique. The outcome was good in both cases.

CONCLUSION

Surgical revascularization may have a role in the treatment of PVA and may prevent stroke. Given the lack of standardized treatment algorithms, individualized regimens should be formulated on a case-specific basis.

Moyamoya syndrome as a manifestation of varicella-associated cerebral vasculopathy-case report and review of literature

BACKGROUND

Varicella-associated cerebral vasculopathy (VACV) is a serious complication of Varicella zoster virus (VZV) infection. VACV has protean manifestations, with varying clinical, radiological features and prognosis.

CASE DESCRIPTION

Moyamoya syndrome (MMS) with VACV is reported in few cases in the past. All the patients were in paediatric age group, presenting with multiple episodes of transient ischemic attacks (TIAs) and infarct. Our case was a 10-year-old Indian girl with ischemic stroke due to VACV who was treated with intravenous acyclovir. She presented 11 months later with multiple episodes of TIAs. Her angiogram showed bilateral moyamoya vasculature. Acetazolamide challenge study revealed areas of hypoperfusion. Previously reported such cases had been treated medically with steroids and antiplatelets. Most of these patients had resolution of motor symptoms after long follow-up; however, this period was marred by recurrent symptoms. Our patient underwent cerebral revascularisation procedure, following which her TIAs resolved, there was improvement in her limb power and, according to her parents, her performance in school has improved at 2-year follow-up.

CONCLUSION

MMS can be a manifestation of VACV and should be suspected in paediatric patient of non-east Asian population. These patients require treatment with intravenous acyclovir to inactivate the virus. Those with TIAs should undergo cerebral revascularisation procedures. Medical management should be reserved for patients with adequate collaterals.