Gastrointestinal bleeding in a patient with a continuous-flow biventricular assist device

Figure 3 Vascular malformation. A: Trichrome staining (10 × magnification) of the jejunum showing dilated artery and vein with attenuated muscularis layer (muscularis indicated by arrow); B: Elastic staining (20 ×) showing dark inner lining of vessel indicating presence of internal elastic lamina of artery (black arrow), contrasted with lack of elastic lamina in adjacent vein. This is also shown at 40 × magnification in C.