Lung of a 60 year old male smoker who suffered from adenocarcinoma of the lung. This form of lung cancer accounts for more than 30 percent of all lung cancers and about half of all non-small cell lung cancers. #Adenocarcinoma forms in glands that secrete mucus. Other than the lungs, adenocarcinoma is most prevalent in cancers found in the prostate, pancreas, esophagus, colon and #rectum. In the lungs, adenocarcinoma tumors most often form in the alveoli, the tiny balloon-like sacs that help pump