label: Mucoid extracellular matrix accumulation
label_lc: mucoid extracellular matrix accumulation
description: "An increase of medial mucoid extracellular matrix creating translamellar and/or intralamellar expansions including extracellular pools as noted on an H&E stain and/or a stain to highlight extracellular matrix material (Movat's pentachrome, Alcian blue, etc.)."