EnDovascular Therapy Plus Best Medical Treatment (BMT) Versus BMT Alone for MedIum VeSsel Occlusion sTroke

Inclusion Criteria: * Acute ischemic stroke * Treatment (arterial puncture) can be initiated 2.1. Within 6 hours of last seen well (LSW) OR 2.2. Within 6 to 24 hours of LSW AND * CT Criteria: Evidence of a hypoperfusion-hypodensity mismatch (Absence of hypodensity on the noncontrast CT within ≥ 90% of the area of the hypoperfused lesion on perfusion CT) * MRI Criteria: Evidence of a diffusion-hyperintensity mismatch (Absence of hyperintensity on fluid-attenuated inversion recovery (FLAIR) imaging within ≥ 90% of the area of the diffusion weighted imaging(DWI) lesion) * Isolated medium vessel occlusion (i.e. an occlusion of the co-/non-dominant M2, the M3/M4 segment of theMCA, the A1/A2/A3 segment of the ACA or the P1/P2/P3 segment of the PCA) confirmed by CT or MRIAngiography * National Institute of Health Stroke Scale (NIHSS) Score of ≥ 4 points or symptoms deemed clearly disabling by treating physician (i.e. aphasia, hemianopia, etc.) * Informed Consent as documented by signature or fulfilling the criteria for emergency consent/ deferral consent * Agreement of treating physician to perform endovascular procedure Exclusion Criteria: * Acute intracranial haemorrhage * Patient bedridden or presenting from a nursing home * In-Hospital Stroke * Known (serious) sensitivity to radiographic contrast agents, nickel, titanium metals or their alloys * Foreseeable difficulties in follow-up due to geographic reasons (e.g. patients living abroad) * Pregnancy or lactating women. A nega…