title: Unexpected Detachment of Solitaire Stents during Mechanical Thrombectomy.
abstract: OBJECTIVE
  Unexpected Solitaire stent detachment can occur during mechanical Solitaire thrombectomy. The purpose of this study was to retrospectively evaluate the influencing factors causing unexpected Solitaire stent detachment and the clinical outcomes.
  
  
  METHODS
  Between October 2011 to December 2013, 232 cases of mechanical Solitaire thrombectomy for acute ischemic stroke were performed in 3 stroke centers. During this period, we encountered unexpected Solitaire stent detachments during mechanical Solitaire thrombectomies in 9 cases.
  
  
  RESULTS
  Solitaire stents unexpectedly detached in 9 cases (3.9%) during the retrieval of Solitaire stents. The median patient age was 76 years. The occlusion sites of the unexpected stent detachment were the proximal middle cerebral artery (MCA) in 7 cases and the internal carotid artery in 2 cases. The sizes of the stents that unexpectedly detached were 6×30 mm in 7 cases, 5×30 mm in 1 case, and 4×20 mm in 1 case. Four patients had unexpected detachment at the first retrieval, 1 patient at the second, 3 patients at the third, and 1 patient at the fifth. In all of the cases of unexpected detachment at the first retrieval, the stent deployment site was the proximal MCA. After detachment, a proximal marker of the Solitaire stent was observed in 3 patients. However, no marker was visible in the remaining 6 patients.
  
  
  CONCLUSIONS
  Unexpected Solitaire stent detachment should be considered in the first instance of stent retrieval for a relatively large-diameter stent, especially in elderly patients with MCA occlusions.
authors: Department of Neurosurgery, Busan Paik Hospital, Inje University, Busan, Korea.
authors: Sung Tae
authors: ST
authors: Kim
authors: Department of Neurosurgery, Haeundae Paik Hospital, Inje University, Busan, Korea.
authors: Sung-Chul
authors: SC
authors: Jin
authors: Department of Diagnostic Radiology, Busan Paik Hospital, Inje University, Busan, Korea.
authors: Hae Woong
authors: HW
authors: Jeong
authors: Department of Neurology, Busan Paik Hospital, Inje University, Busan, Korea.
authors: Jung Hwa
authors: JH
authors: Seo
authors: Department of Neurology, Haeundae Paik Hospital, Inje University, Busan, Korea.
authors: Sam Yeol
authors: SY
authors: Ha
authors: Department of Diagnostic Radiology, S Pohang Hospital, Pohang, Korea.
authors: Hae Wook
authors: HW
authors: Pyun
keywords: Stents; Stroke; Thrombectomy
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