NCIt definition : A term that refers to a vascular lesion characterized by an extracellular lipid pool
with intimal smooth muscle cell loss typically adjacent to the medial wall in addition
to varying degrees of macrophage infiltration near the lumen. (Arteriosclerosis, Thrombosis,
and Vascular Biology. 2007; 27:986-989);
Alternative definition : CDISC: An increase in matrix, without an increase in cell numbers, between the endothelium
and the internal elastic lamina. (INHAND);