What is behind the doughnut?

Image in interventional cardiovascular medicine: what is displayed on this image? ... And do not hesitate to comment on how you would treat this case!

What is the true calcium architecture that explains the doughnut sign from comprehensive in-vivo imaging modalities (PCCT, OCT & IVUS)?

An image is worth a 1,000 words: participate in the quiz below to tell us what you see in this image!

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Authors

Huang J.¹, Dai R.¹, Sun Y.², He R.¹, Fezzi S.³, Chen Z.², Wang N.², Xiao H.², Zhang D.², Wang Y.², Wijns W.⁴, Tu S.¹

1. Med-X Institute, Shanghai, CHINA
2. Department of Radiology, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, CHINA
3. University of Verona, VR, ITALY
4. Lambe Institute for Translational Research, Galway, IRELAND