Case A 31-year-old male athlete presented with acute chest pain that was aggravated with swallowing after completing a marathon. Physical examination findings and his vital signs were normal. Electrocardiography revealed showed sinus rhythm, an incomplete right bundle block, and a negative T wave in V1-V2. A blood analysis showed normal D-dimer values and a slightly elevated troponin-I level (maximum at 72 hours: 0.52 ng/mL; normal,