IMG_4254.jpg
Dissect this image. Identify anatomy
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Reading File
Coronary Angiogram - Left Coronary System
This is a left coronary angiogram, most consistent with an RAO caudal ("Spider") view or similar cranially-tilted projection. Here is a full anatomical dissection:
Structures Identified
| Structure | Description |
|---|---|
| Catheter | Visible top-left, seated at the ostium of the Left Main Coronary Artery (LMCA) |
| Left Main Coronary Artery (LMCA) | Short, wide trunk arising from the left coronary sinus; bifurcates (or trifurcates) before giving rise to the LAD and LCx |
| Left Anterior Descending (LAD) | Runs anteriorly/inferiorly toward the cardiac apex; the large vessel oriented toward the right of the image |
| Diagonal branches (D1, D2) | Lateral branches off the LAD supplying the anterolateral wall |
| Septal perforators | Small branches off the LAD descending vertically to supply the interventricular septum |
| Left Circumflex (LCx) | Courses posterolaterally; gives rise to Obtuse Marginal (OM) branches supplying the lateral/posterior wall |
| Obtuse Marginal (OM) branches | The vessel system running inferiorly in the image |
Red Arrow - The Key Finding
The red arrow points to an abrupt cutoff / total occlusion of what appears to be the mid-LAD or a major septal/diagonal branch. The features are:
- Blunt stump: contrast terminates abruptly with no tapering
- No distal opacification: TIMI 0 flow beyond the lesion
- This is the hallmark of either:
- An acute total occlusion (in the setting of STEMI)
- A Chronic Total Occlusion (CTO)
Other Notable Findings
- Severe proximal-mid LAD stenosis: A high-grade narrowing is visible in the proximal-to-mid LAD segment, separate from the total occlusion site
- The LCx and OM branches appear to fill reasonably well distally
Clinical Significance
This angiogram pattern - total occlusion of the LAD territory with an associated severe stenosis - is characteristic of a left anterior descending artery STEMI or a high-risk multivessel CAD presentation. The culprit vessel (arrow) would typically be the target for primary PCI (percutaneous coronary intervention) with stenting.
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