MKI67 and carcinoid tumor: Among the most common lung NETs, typical carcinoid was diagnosed in 69 cases (Ki-67 1.6 (1.0–2.8), atypical carcinoid in 20 cases (Ki-67 9.8 (6.2–11.0) and diffuse idiopathic pulmonary neuroendocrine cell hyperplasia (DIPNECH) in one case.