Table 2: Histological findings of central and peripheral squamous cell carcinomas.

CentralPeripheral value
Positive cases/total cases (%)

Alveolar filling pattern1/12 (8)8/30 (27)0.16
Infiltrating pattern11/12 (92)22/30 (73)0.16
Inflammation9/12 (75)25/30 (83)0.85
Necrosis12/12 (100)27/30 (90)0.35
Fibrosis inside the tumor12/12 (100)28/30 (93)0.51
Keratinization8/12 (67)19/30 (63)0.57
Capsule3/12 (25)4/30 (13)0.91
Background lung fibrosis4/11 (36)14/30 (47)0.41
Traction bronchiectasis6/11 (55)9/30 (30)0.14
Visceral pleural invasion7/15 (47)19/35 (54)0.62
Emphysema (microscopic)6/13 (46)24/31 (77)0.039
Interstitial pneumonia (microscopic)2/13 (15)17/31 (55)0.015