Figure 4
From: Cystic adventitial disease of the popliteal artery: features on 3T cardiovascular magnetic resonance
(a) The cyst wall is comprised of dense, fibrous tissue, which is consistent with the adventitia of a blood vessel (H&E stain; 40×, original magnification). (b) At higher magnification (H&E stain; 100×, original magnification), foci of hemorrhage is seen within the cyst wall (arrows). (c) There were also focal areas of chronic inflammation within the cyst wall (circled areas) [H&E stain; 100×, original magnification]. (d) The cyst contents consist mostly of proteinaceous debris with rare, scattered degenerated macrophages (arrow) [H&E stain; 400×, original magnification].