Lung cancer the leading cause of cancer related death in the world.<unk>  (BAC) was first described by Malassez in 1876 as a bilateral,multinodular malignant pulmonary<unk> . "<unk>  cell<unk> " term was first coined by Leibow in 1960 due to confusion over cell type. BAC was use as a term in 1999 and 2004 WHO classification for a broad range of tumors including single small non-invasive peripheral lung tumor, minimally invasive adenocarcinoma, mixed subtype invasive adenocarcinoma, mucinous and nonmucinous subtypes that are previously known as BAC and advanced type with invasion and poor prognosis. The 1999 WHO classification was largely based on histologic characteristics, the 2004 revised classification in addition to  histological factors  took other factors like genetic and clinical factors into consideration but these two classification continue to use the term BAC. Later, in 2011 IASLC in collaboration with other lung societies introduced a new classification based on multidisciplinary approach to avoid the confusion related to use of BAC for broad range of tumors.<unk>  is a preinvasive<unk>  with no stromal,vascular and pleural invasion. Adenocarcinoma in situ, minimally invasive adenocarcinoma and invasive adenocarcinoma of the lung are the relatively new terms that were introduced in 2011 IASLC/ATS/ERS classifications for<unk>  (BAC). BAC is usually asymptomatic but may present with cough, hemoptysis, chest pain, loss of appetite and weight loss. It is a rare pulmonary tumor and the incidence for BAC varies from 4-24% of all the primary lung malignancies. Surgery is the mainstay of treatment but mucinous type respond very well to chemotherapy because of genetic associations. The five year survival rate for surgically resected tumor is 100%.
Bronchoalveolar carcinoma
Bronchioloalveolar carcinoma
Mesothelioma
Tuberculosis
Sarcomatoid carcinoma of the lung
Large cell carcinoma of the lung
Adenocarcinoma of the lung
Squamous cell carcinoma of the lung