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Correspondence on “Delayed collapse of flow diverter due to acute severe vasospasm: another concern for flow diversion in ruptured aneurysms” by Kumar et al
  1. Francesco Mistretta1,
  2. Riccardo Russo2,
  3. Stefano Molinaro2,
  4. Mauro Bergui2
  1. 1 Department of Surgical Sciences, Radiology Unit, University of Turin, Azienda Ospedaliera Città della Salute e della Scienza Hospital, Turin, Italy
  2. 2 Department of Neuroscience, Neuroradiological Unit, University of Turin, Azienda Ospedaliera Città della Salute e della Scienza Hospital, Turin, Italy
  1. Correspondence to Dr Francesco Mistretta, Department of Surgical Sciences, Università degli Studi di Torino, Torino, Italy; francescomistretta93{at}

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We read with interest the case report by Kumar et al published online in June 2022.1 The authors deployed a flow diverter stent (FDS) (Silk Vista Baby, Balt, Montgomery, France) on a ruptured dissecting aneurysm of the right posterior cerebral artery. In the following days an extensive remodeling of the FDS was evident, including both dilation at the base of the aneurysm and stenosis at the proximal end (so-called fish-mouthing), the latter due to spasm of the basilar artery. Despite resolution of the spasm, the proximal stenosis did not resolve. The FDS prevented further re-bleeding; however, the patient eventually died from …

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