Lung fibrosis, or pulmonary fibrosis, takes place when damaged and scarred tissue in the lung causes it to dysfunction, explains Mayo Clinic. The cause of lung fibrosis is unknown as of 2015, and the lung damage is irreparable.

As of 2015, the prognosis for cystic fibrosis is hopeful for many children and younger adults, but chronic lung disease sidelines adults, according to MedlinePlus. The average life expectancy is age 37 for cystic fibrosis patients. Researchers continue to search for a cure.

According to the American Cancer Society, the observed 5-year survival rate for patients who are diagnosed with stage II lung cancer is around 30 percent. Depending on the location and other qualities of the primary tumor, stage II lung cancer can be divided between types IIA and IIB. Survival rates

The American Cancer Society lists the 5-year survival rate for stage IV non-small-cell lung cancer as about one percent; stage IV small-cell lung cancer 5-year survival rates are at two percent. Mesothelioma has a 5-year survival rate of five to ten percent.

Fibrosis refers to the formation of fibrous tissue, according to The Free Dictionary. An example is congenital hepatic fibrosis, in which the liver forms wide bands of fibrous tissue in an irregular pattern. The tissue contains cysts from faulty terminal bile ducts and leads to constricted blood flo

Causes of pulmonary fibrosis include environmental factors, radiation treatments, certain medications and medical treatments. In most cases, however, no known cause is discovered, according to Mayo Clinic.

Around 30 percent of patients diagnosed with lung cancer have already reached stage 3, and their prognosis varies according to multiple factors, according to Dr. Lynne Eldridge, writing for About.com. The median survival time for stage 3a non-small cell cancer is 15 months, and stage 3b patients hav

Cystic fibrosis is a genetic disease in which a mutation causes bodily secretions, such as mucus, digestive juices and sweat, to have a thick, sticky consistency rather than a thinner, more slippery quality, explains Mayo Clinic. In healthy individuals, these secretions serve as a lubricant for the

Medications can help to slow the progression of interstitial lung disease, but many patients never regain the full use of their lungs, according to Mayo Clinic. Lung scarring due to interstitial lung disease is generally permanent, and treatment does not always stop the progression of the disease.

The prognosis for a blood clot in the lung depends on the size and location of the clot and how quickly treatment for the clot is initiated, according to eMedicineHealth. The bigger the blood vessel being blocked and the larger the clot, the worse the prognosis.