Volume 44, Issue 5, Pages (November 2003)

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Volume 44, Issue 5, Pages 603-609 (November 2003) Comparison of Partial Urethral Replacement with Acellular Matrix versus Spontaneous Urethral Regeneration in a Canine Model Ahmed Shokeir, Yasser Osman, Mohamed El-Sherbiny, Mahmoud Gabr, Tarek Mohsen, Mahmoud El-Baz European Urology Volume 44, Issue 5, Pages 603-609 (November 2003) DOI: 10.1016/j.eururo.2003.07.003

Fig. 1 Examples of ascending urethrogram of the study group: (a) normal urethra before surgery; (b) normal appearance at 1 month.;(c) relative narrowing at 1 month; and (d) urethral diverticulum at 1 month. European Urology 2003 44, 603-609DOI: (10.1016/j.eururo.2003.07.003)

Fig. 2 Acellular matrix before implantation showing intact fiber framework consisting of elastin and collagen. (H&E ×100). European Urology 2003 44, 603-609DOI: (10.1016/j.eururo.2003.07.003)

Fig. 3 Examples of histopathological examination at different time points after implantation of acellular matrix: (a) at 1 week, there is infiltration of the graft by red blood cells and mononuclear cells (H&E ×100), (b) at 2 weeks, the epithelium developed in uniform lining covering the matrix border (H&E ×100), (c) at 2 weeks, some myofibroblasts stained with trichrome (Trichrome ×200), (d) at 3 weeks, the urethral lumen is completely covered by irregular epithelium; vessels of larger diameters in the matrix are apparent (H&E ×200), (e) at 3 weeks, the submucosa is filled with myofibroblasts infiltrating the matrix (α-actin ×200), (f) at 8 weeks, the epithelium is regular; good vessel supply in the submucosa is apparent (H&E ×200), (g) at 8 weeks, α-actin staining showing myofibroblasts in the vessel walls (α-actin ×200), and (h) at 20 weeks, the graft appears as normal tissue similar to surrounding host tissue. European Urology 2003 44, 603-609DOI: (10.1016/j.eururo.2003.07.003)

Fig. 3 Examples of histopathological examination at different time points after implantation of acellular matrix: (a) at 1 week, there is infiltration of the graft by red blood cells and mononuclear cells (H&E ×100), (b) at 2 weeks, the epithelium developed in uniform lining covering the matrix border (H&E ×100), (c) at 2 weeks, some myofibroblasts stained with trichrome (Trichrome ×200), (d) at 3 weeks, the urethral lumen is completely covered by irregular epithelium; vessels of larger diameters in the matrix are apparent (H&E ×200), (e) at 3 weeks, the submucosa is filled with myofibroblasts infiltrating the matrix (α-actin ×200), (f) at 8 weeks, the epithelium is regular; good vessel supply in the submucosa is apparent (H&E ×200), (g) at 8 weeks, α-actin staining showing myofibroblasts in the vessel walls (α-actin ×200), and (h) at 20 weeks, the graft appears as normal tissue similar to surrounding host tissue. European Urology 2003 44, 603-609DOI: (10.1016/j.eururo.2003.07.003)

Fig. 4 Example of histopathology of one of the control dogs at 8 weeks showing partial regeneration of the urethral mucosa with slight fibrosis in the subepithelial layer and normal smooth muscle fibres (H&E ×200). European Urology 2003 44, 603-609DOI: (10.1016/j.eururo.2003.07.003)