Fig. 1
From: Role of CT in differentiation between subtypes of lung cancer; is it possible?
Four different cases of squamous cell carcinoma. a shows the classical CT appearance with thick walled central hilar cavitary lesion. b shows a peripheral thick cavitary lesion with invasion of the pleura, chest wall, and the posterior mediastinum. c shows a superior sulcus tumor with invasion of the chest wall (not shown) and d shows a speculated lung parenchymal mass lesion separable from the hilum (not shown) invading the mediastinum