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Histologic appearance of patient's type Ir PPB. (A) Thin-walled multilocular subpleural cysts. H&E, original magnification 20 ×. (B) Variably cellular cyst walls without obvious “cambium” layer. H&E, 40 ×. (C) Benign respiratory-type epithelium with focal cilia. H&E, 600 ×.
