Pericarditis was diagnosed when patients sustained attacks of pleuritic retrosternal chest pain and had typical findings in the electrocardiogram, echocardiogram or chest
[ncbi.nlm.nih.gov]
Patients with acute pericarditis commonly present with acute, sharp, retrosternal chest pain that is relieved by sitting or leaning forward.
[aafp.org]
Differential: esophageal disorders, costochondritis, acute MI, aortic dissection, pulmonary embolus, gastritis/PUD History: Chest pain, usually retrosternal, sudden, and pleuritic
[utswim.wordpress.com]