Figure 13 One-month postoperative case shows: (a, b) Merocel packed side revealing respiratory epithelium resting on thickened basal lamina (↑) and excessive cellular infiltration (↑↑) and hyperglandular activities (g). (c, d) Gelfoam packed side with restored respiratory epithelium resting on thin basal lamina. The lamina propria shows edema and congested blood vessels (bv). Hematoxylin and eosin stain Mic. magnification, a and c, ×100; b and d, ×400.