The attached video explains the lung tumour and all of the types very efficiently. Have a look at this video. TIMELINE: 0:00 Introduction 0:11 types of lung tumours 0:25 Adenocarcinoma 0:28 Gross features 0:59 Precursor lesions of adenocarcinoma 2:35 Invasive adenocarcinoma 3:23 Squamous cell carcinoma 3:6 Gross Features 4:11 Microscopic features 4:56 Precursor lesions 5:34 Small cell carcinoma 5:38 Gross features 5:53 Microscopic features 8:15 Large cell carcinoma 8:19 Microscopic features