[Table/Fig-6a-c]:

Surgical lung biopsy (a) HE, X100 shows lymphocytic infiltrates in germinal centers in a peribronchial distribution and extending into the interlobular septa (arrows) sparing the alveolar septa. (b) Higher power view HE, X 200 The peribronchial lymphoid tissue has germinal center, and consists of mature lymphocytes, (c) A large germinal center seen adjacent to the bronchiole (right arrow), another germinal center involving the bronchial wall and projecting into the bronchial lumen, almost completely occluding the bronchiole (left arrow) HE, X400