| Summary: | A 41-year-old woman presented with an inferolateral ST-segment elevation myocardial infarction. Coronary angiography confirmed the presence of a long narrowing involving the right coronary artery posterolateral branch (figure 1A, white arrows). Spontaneous coronary artery dissection was suspected and optical coherence tomography (OCT) imaging was considered by the operator for confirmation purposes. Advancing the OCT catheter was difficult due to lack of support and it was decided to only interrogate the proximal aspect of the branch (figure 1B, arrow). OCT revealed the presence of an intramural hematoma without entry tear (figure 1C; asterisks denote wire artefact). At that moment the patient complained of chest pain that remained after removing the OCT catheter. The presence of functional branch occlusion (figure 1D, asterisk), with Thrombolysis in Myocardial Infarction (TIMI) grade 1 flow, was confirmed. Coronary flow was re-established through gentle dilation (4 atm) using a 1.5 mm balloon. Final TIMI grade 2 flow was achieved (figure 1E, asterisks) and the patient became asymptomatic. Her subsequent clinical course was uneventful. Coronary angiography performed 3 months later confirmed the complete healing of the dissected segment (figure 1F, arrows).
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