What condition involves the inflammation of the inner tunic of the heart?

The condition that involves inflammation of the inner tunic of the heart is endocarditis. This inflammation specifically affects the endocardium, which is the inner lining of the heart chambers and valves. Endocarditis is typically caused by an infection, where bacteria or other pathogens enter the bloodstream and settle in the heart, leading to inflammation and irritation of this delicate layer.

In the case of myocardial inflammation, as seen in myocarditis, it affects the heart muscle itself rather than the inner lining. Aneurysms refer to bulges in blood vessel walls and do not involve inflammation of heart layers. Fibrosarcoma is a type of cancer arising from connective tissues and is unrelated to inflammation of the heart's tunics. Understanding these distinctions helps clarify why endocarditis specifically pertains to the inner tunic of the heart.