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  Indian J Med Microbiol
 

Figure 2: Gross photomicrograph showing a large cyst measuring 7.5 cm × 5 cm, the periphery of which showed multiple small cysts (range: 0.3-1 cm) (a). Microscopy shows a cyst wall lined by ciliated pseudostratified respiratory epithelium with loose mesenchymal stroma admixed with inflammatory cells in the subepithelium (b, ×100). Thick row of small primitive cells beneath the lining epithelium (c, ×100). Single focus of nodular aggregates of blue appearing primitive cells within the septa (d, ×100). Blastemal nodules diffusely immunopositive for desmin (e, ×100) and focally for myogenin (f, ×100)

Figure 2: Gross photomicrograph showing a large cyst measuring 7.5 cm × 5 cm, the periphery of which showed multiple small cysts (range: 0.3-1 cm) (a). Microscopy shows a cyst wall lined by ciliated pseudostratified respiratory epithelium with loose mesenchymal stroma admixed with inflammatory cells in the subepithelium (b, ×100). Thick row of small primitive cells beneath the lining epithelium (c, ×100). Single focus of nodular aggregates of blue appearing primitive cells within the septa (d, ×100). Blastemal nodules diffusely immunopositive for desmin (e, ×100) and focally for myogenin (f, ×100)