According to the American Joint Committee on Cancer (AJCC) staging system, there are 4 stages of malignant lung mass, based on 3 factors: tumor size, lymph node invasion, and metastasis. Each stage is assigned a letter and a number  that designate T for tumor size, N for node invasion, and M for metastasis.
Lung mass staging
Lung mass evaluation
Lung cancer staging
Adenocarcinoma of the lung staging
Squamous cell carcinoma of the lung staging
Lung cancer biopsy
Small cell carcinoma of the lung staging
Large cell carcinoma of the lung staging