Pancreatectomy and splenectomy for a splenic aneurysm associated with segmental arterial mediolysis

Figure 4 Histopathology revealed an adventitial-medial junction created by separation of the media from the adventitia and organized thrombi deposited at the site. A: Organized thrombi were deposited at the adventitial-medial junction created by the incipient separation of the media from the adventitia (arrow). Elastica Van Gieson stain; magnification × 4; B: Mediolysis can involve the entire medial muscle with preservation of the intima and internal elastica (arrow). The overlying adventitial-medial junction is suffused with fibrin. Hematoxylin Eosin stain; Magnification × 2.