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Figure 2 | BMC Urology

Figure 2

From: Interpositional substitution of free vas deferens segment autografts in rat: feasibility and potential implications

Figure 2

Grading system. (a) Grade 0: Control vas graft; normal histology. (b) Grade 1: Loss of stellate lumen but maintenance of periluminal smooth muscle continuity. (c) Grade 2: Reduction in mass and progressive fibrosis of the longitudinal and circular smooth muscle causing discontinuity of muscle layers. (d) Grade 3: Smooth muscle layers are largely replaced by fibrous tissue surrounded by a revascularizing, thickened adventitia.

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