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Restenosis in a Collapsed Magnesium Bioresorbable Scaffold.

Optical coherence tomography (OCT) may provide important mechanistic information in restenosis after treatment using bioresorbable scaffolds (BRS). Here, we present the signature findings by OCT of a novel magnesium BRS with in-segment restenosis 7 months postimplantation. A 65-year-old male presenting with stable angina was treated for a 95% stenosis in the proximal left anterior descending artery. The lesion was predilated with a semicompliant balloon 2.5×12 mm and a scoring balloon 3.0×13 mm before implanting a 3.5×15 mm magnesium BRS (Magmaris; Biotronik AG, Bulach, Switzerland) carefully sized by OCT. The magnesium BRS was postdilated using a 3.75×8 mm noncompliant balloon. Final angiography and OCT showed good expansion and apposition of the scaffold without …