Criteria for diagnosis of benign or malignant nodules on chest CT films Lesions are considered malignant when one or more of the following criteria are combined: Lung nodule > 2 cm in diameter Located in the upper lobe In the periphery of the lung The margin is irregular or spiculate 9 The shape is lobuted or irregular Contains bronchial airways or air bulbs (pseudo-cavernous) The wall of the cave is thick (> 15 mm), the cave does not contain the fluid - gas level No calcification or no typical benign ingredient Strong contrast enhancement (> 15HU).