Histology of bronchial epithelium. Grades of dysplasia in bronchial epithelium.
(A) Normal two-layered epithelium; (B) squamous metaplasia; (C) mild dysplasia;
(D) moderate dysplasia; (E) severe dysplasia; (F) carcinoma in situ.

Esophageal Cancer: various grades of dysplasia.
(LGD=Low Grade Dysplasia; HGD=High Grade Dysplasia; ACA=Adenocarcinoma)