Takeaki Sato* and Shigeki Kushimoto
A 53-year-old man presented with sudden posterior chest pain without any preceding causative events. He had no significant medical history, including conditions requiring antithrombotic medication. His consciousness was clear, blood pressure was 110/80 mmHg, heart rate was 70 beats per minute (bpm), respiratory rate was 14 per minute, and SpO2 was 98% in room air.
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