Volume 115, Issue 2, Pages (February 1999)

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Volume 115, Issue 2, Pages 490-495 (February 1999) Bioabsorbable Self-reinforced Poly-l-Lactide, Metallic, and Silicone Stents in the Management of Experimental Tracheal Stenosis Korpela Antti , MD, Aarnio Pertti , MD, Sariola Hannu , MD, Törmälä Pertti , Ph D, Harjula Ari , MD CHEST Volume 115, Issue 2, Pages 490-495 (February 1999) DOI: 10.1378/chest.115.2.490 Copyright © 1999 The American College of Chest Physicians Terms and Conditions

Figure 1 Tracheal epithelium of a rabbit with a metallic stent, 6 months postimplantation. The groove was caused by the wire of the stent (center) (hematoxylin-eosin, original × 200). CHEST 1999 115, 490-495DOI: (10.1378/chest.115.2.490) Copyright © 1999 The American College of Chest Physicians Terms and Conditions

Figure 2 Masses of polypoid granulation tissue (left) at the end of the silicone stent, 6 months postimplantation (hematoxylin-eosin, original × 20. CHEST 1999 115, 490-495DOI: (10.1378/chest.115.2.490) Copyright © 1999 The American College of Chest Physicians Terms and Conditions

Figure 3 Scanning electron micrograph of the epithelium between stent spirals, showing a continuous ciliated epithelial cell layer and solitary nonciliated cells, comparable to normal tracheal epithelium in rabbits. The image is from a rabbit with an SR-PLLA stent, 7 months postoperative. (original ×1,600; bar = 20 μm). CHEST 1999 115, 490-495DOI: (10.1378/chest.115.2.490) Copyright © 1999 The American College of Chest Physicians Terms and Conditions

Figure 4 Scanning electron micrograph showing uncovered basal membrane, red blood cells, and cell debris; the trachea specimen was taken from under a silicone stent, 18 weeks postoperative (original× 1,800; bar = 20 μm). CHEST 1999 115, 490-495DOI: (10.1378/chest.115.2.490) Copyright © 1999 The American College of Chest Physicians Terms and Conditions

Figure 5 Scanning electron micrograph of a specimen from a rabbit with a metallic stent, 13 weeks postoperative. Filaments of the stent, partly covered by the epithelium, are visible (original ×75; bar = 500 μm). CHEST 1999 115, 490-495DOI: (10.1378/chest.115.2.490) Copyright © 1999 The American College of Chest Physicians Terms and Conditions

Figure 6 Scanning electron micrograph of a specimen from a rabbit with a metallic stent, 14 weeks postoperative, showing the epithelium with ciliated cells and some nonciliated cells between filaments of the stent. (original ×1,550; bar = 20 μm). CHEST 1999 115, 490-495DOI: (10.1378/chest.115.2.490) Copyright © 1999 The American College of Chest Physicians Terms and Conditions