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Esophageal cancer can also spread to the lungs, liver, stomach, and other parts of the body. There are two major types of esophageal cancer: 1  Squamous cell carcinoma. 2  This type of esophageal cancer starts in squamous cells that line the esophagus. 3  It usually develops in the upper and middle part of the esophagus.
The alveolar sacs consist of many alveoli and are composed of a single layer of epithelial tissue. There are about 700 million alveoli in the adult lung. The average, healthy adult lungs hold about 13 to 13.5 pints of air (about six liters). The alveoli are considered the functional unit of the lung. In the spaces between the alveoli of the lungs is elastic connective tissue which is important for exhalation. The alveoli are surrounded by a network of pulmonary capillaries.