In its classic definition, by FranÃ§ois-Louis Ganshof (1944), feudalism describes a set of reciprocal legal and military obligations among the warrior nobility revolving around the three key concepts of lords, vassals and fiefs.
The exact cause of intracardiac echogenic foci remains unclear; however, they appear to be caused by small deposits of calcium in the papillary muscle of the fetal heart.
Infective endocarditis (IE) is an infection of the endocardium of the heart. IE produces both intracardiac effects - eg, valvular insufficiency and a wide variety of systemic effects, both from emboli (sterile and infected) and a variety of immunological mechanisms.