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(a), Tubular-predominant tumor invades bronchial cartilage (case 3). (b), Tubular-predominant tumor (case 7) shows two cell populations: inner ductal cells and the outer myoepithelial cells. (c), Cribriform-predominant tumor with cylindromatous microcystic spaces containing basophilic mucoid material and perineural invasion (case 6). (d), Cribriform tumor with hyalinized basement membrane material (case 5).
