IVUS rings mapping a patient's history.

Area of Science:

• Cardiovascular Medicine
• Interventional Cardiology
• Medical Imaging

Background:

• Stent thrombosis remains a significant complication following percutaneous coronary intervention.
• Intravascular ultrasound (IVUS) is a valuable tool for assessing stent deployment and identifying potential causes of stent failure.

Observation:

• A patient presented with acute stent thrombosis.
• Intravascular ultrasound imaging demonstrated unusual concentric layers of stent material.
• These layers resembled the growth rings of a tree, suggesting progressive stent malapposition or under-expansion.

Findings:

• The IVUS findings indicated three distinct layers of progressively under-expanded stent struts.
• This unique morphology is hypothesized to be a contributing factor to the development of stent thrombosis.
• The 'tree ring' appearance highlights a potential pattern of stent failure.

Implications:

• This case illustrates a rare but important IVUS finding in stent thrombosis.
• Understanding this 'tree ring' morphology may improve the diagnosis and management of stent-related complications.
• Further research into the mechanisms and prevalence of this finding is warranted.