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.
Parenchyma is the functional part of kidneys. Echogenicity means the kidneys are affected. This test result may indicate different causes such as chronic nephritis, Polycystic Kidney Disease, gouty nephropathy or some vascular diseases. Diagnosis needs further tests.