Warthin tumor (y Definition A tumor composed of glandular and often cystic structures, sometimes with a papillary cystic arrangement, lined by characteristic bilayered epithelium comprising inner columnar eosinophilic or oncocytic cells surrounded by smaller basal cells The stroma contains a variable amount of lymphoid tissue with germinal centres 腔医学院 唾液腺肿瘤Definition A tumor composed of glandular and often cystic structures, sometimes with a papillary cystic arrangement, lined by characteristic bilayered epithelium, comprising inner columnar eosinophilic or oncocytic cells surrounded by smaller basal cells. The stroma contains a variable amount of lymphoid tissue with germinal centres. 唾液腺肿瘤 2