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The primary site of inflammation in pericarditis is the pericardial sac. Pericarditis is an inflammatory condition that specifically affects the pericardium, which is the double-walled membrane surrounding the heart. When the pericardium becomes inflamed, it can lead to chest pain and other symptoms due to the irritation and friction between the layers of the pericardium.

Identifying the correct site of inflammation is crucial for understanding the condition's pathophysiology and guiding appropriate management. The inflammation directly impacts the pericardial sac, which can lead to complications such as fluid accumulation (pericardial effusion) or constrictive pericarditis if not managed properly.

In contrast, the myocardium refers to the heart muscle itself, the epicardium is the outer layer of the heart wall, and the endocardium is the innermost lining of the heart. While inflammation in these areas can occur in other cardiac conditions, they are not the primary sites affected in pericarditis.