Re-treatment rates after treatment with the pipeline embolization device alone versus pipeline and coil embolization of cerebral aneurysms: A single-center experience

Min S. Park, Michael Nanaszko, Matthew R. Sanborn, Karam Moon, Felipe C. Albuquerque, Cameron McDougall

Research output: Contribution to journalArticle


Objective The optimal strategy for use of the Pipeline Embolization Device (PED, ev3 Neurovascular) has not been clearly defined. The authors examined re-treatment rates after treatment with PED alone versus PED and adjunctive coil embolization (PED/coil). Methods The authors retrospectively examined cerebral aneurysms treated with the PED from May 2011 to March 2014. Overall, 133 patients (25 men, 108 women; mean age 60.4 years, range 23-85 years) were treated for 140 aneurysms (mean size 11.8 ± 8.3 mm) requiring 224 PEDs (mean 1.7 PEDs per patient). Sixty-eight patients (13 men, 55 women) were treated with PED alone for 73 aneurysms (mean size 10.6 ± 9.2 mm) and 65 patients (12 men, 53 women) were treated with PED/coil for 67 aneurysms (mean size 12.8 ± 7.4 mm). Results Eight aneurysms in 8 patients were re-treated in the PED-alone cohort versus only 1 aneurysm in 1 patient in the PED/coil cohort for re-treatment rates of 11.8% (8/68) and 1.5% (1/65), respectively (p = 0.03). Two patients in the PED-alone cohort were re-treated due to PED contraction, while the other 6 were re-treated for persistent filling of the aneurysms. The PED/coil patient experienced continued filling of a vertebrobasilar artery aneurysm. No aneurysms in either group ruptured after treatment. Conclusions Adjunctive coil embolization during flow diversion with the PED resulted in a significantly lower retreatment rate compared with PED alone, suggesting an added benefit with adjunctive coil embolization. This result may provide the basis for future evaluation with randomized, controlled trials.

Original languageEnglish (US)
Pages (from-to)137-144
Number of pages8
JournalJournal of Neurosurgery
Issue number1
Publication statusPublished - Jul 1 2016
Externally publishedYes



  • Aneurysms
  • Coil embolization
  • Flow diversion
  • Pipeline Embolization Device
  • Re-treatment
  • Vascular disorders

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology

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