TY - JOUR T1 - Transient in-stent stenosis at mid-term angiographic follow-up in patients treated with SILK flow diverter stents: incidence, clinical significance and long-term follow-up JF - Journal of NeuroInterventional Surgery JO - J NeuroIntervent Surg SP - 166 LP - 170 DO - 10.1136/neurintsurg-2018-013928 VL - 11 IS - 2 AU - Fahad Essbaiheen AU - Hanan AlQahtani AU - Taleb Mohamed Almansoori AU - Elena Adela Cora AU - Satya Patro AU - Vered Tsehmaister-Abitbul AU - Brian Drake AU - Howard Lesiuk AU - Stephanos Nikolaos Finitsis AU - Daniela Iancu Y1 - 2019/02/01 UR - http://jnis.bmj.com/content/11/2/166.abstract N2 - Background Little is known about in-stent stenosis (ISS) in patients with aneurysms treated with flow diverter (FD) stents. The reported incidence in the literature varies significantly.Objective The aim of this study was to assess the incidence, severity, distribution, clinical significance, and possible predictors for ISS.Methods Between July 2012 and June 2016 we retrospectively reviewed all patients treated with SILK FDs in our center. Only cases with short-term (4±2 months) and long-term (>1 year) follow-ups with digital subtraction angiograms were included. ISS was graded as mild (<25%), moderate (25–50%) or severe (>50%). The following predictors for ISS were assessed: gender, age, the presence of subarachnoid hemorrhage, aneurysm size, location, occlusion status, and post-stenting angioplasty.Results Thirty-six patients met the inclusion criteria. At mid-term follow-up, ISS was observed in 16/36 patients (44%). Eleven patients (69%) had mild ISS, three (19%) moderate, and two (12%) severe ISS. ISS was diffuse in 11 patients (69%) and focal in five patients (31%). All patients were asymptomatic. Thirteen patients were maintained on dual antiplatelet therapy and three on aspirin alone. At long-term follow-up, complete ISS resolution was seen in 11 patients, improvement in three and worsening in two patients. No de novo ISS occurrence was observed. On univariate analysis there was no significant predictor for ISS.Conclusions Transient ISS after FD deployment is a common asymptomatic finding on mid-term angiographic follow-up. Complete resolution or improvement at long-term follow-up is seen in most patients who are maintained on dual antiplatelet therapy. ER -