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.
Focal dilatation of the pulmonary arteries can be congenital or acquired. Common causes include vasculitis, infection, neoplasm, and trauma, often iatrogenic [1, 2]. On radiographs, aneurysms may appear as hilar enlargement or a lung nodule. The diagnosis is usually confirmed with contrast-enhanced CT.