Treatment Decision-Making in Distal-Medium Vessel Occlusions: A Case-Based Perspective Review

Purpose of Review: Medium and distal vessel occlusions (DMVOs) account for approximately one third of all acute ischemic strokes, yet their optimal management remains uncertain. While endovascular treatment (EVT) is well established for large vessel occlusions, its role in DMVOs remains controversial. This review aims to explore the key challenges of EVT decision-making in DMVO stroke using a case-based approach. Recent Findings: Recent randomized controlled trials investigating EVT in DMVOs have demonstrated neutral overall results, underscoring the need for more refined patient selection rather than routine intervention. Intravenous thrombolysis (IVT) remains the first-line reperfusion therapy and appears particularly effective in DMVOs, often achieving early recanalization. However, EVT decision-making is complicated by diagnostic uncertainty on standard imaging, mild neurological deficits, heterogeneous tissue viability, and increased technical complexity related to small, tortuous distal vessels. Summary: EVT for DMVO stroke requires individualized decision-making that integrates clinical eloquence, imaging findings, responsiveness to IVT, and procedural risk. Through three illustrative clinical cases, this review highlights why DMVOs represent a stroke subtype with a narrow and fragile therapeutic window in which careful patient selection and technical expertise are essential to maximize benefit and minimize harm.