Primary Cardiac Angiosarcoma in a Young Male: Rare Presentation With Right Atrial Endocardial Dissection and Right Coronary Artery Tumor Fistula. - Akiash, Nehzat; Rezaee Kalantari, Ramtin; Abbaspour, Somayeh; Masoumi, Mahlasadat; Eslami, Narges; Akiash, Nasibeh; Pazoki, Mahboubeh; Rajabzadeh, Shahab; Mostafavi, Soroush (Clinical Case Reports, 2026)