Transplantation of a long tracheal allograft segment after prior heterotopic revascularization (Rabbit 1). (A) Macroscopic aspect on Day 3: longitudinal section of the central airway showing stenosis of the fascial flap-wrapped graft, and circumferential thickening of the fascia (arrow). (B) Histological examination of the graft showing numerous neovessels in the lamina propria (small arrows), and a viable cartilage ring (star) (haematoxylin–eosin–saffron stain ×25).