Merck Manual

Please confirm that you are not located inside the Russian Federation

honeypot link

Overview of Lung Tumors


Robert L. Keith

, MD, Division of Pulmonary Sciences and Critial Care Medicine, Department of Medicine, Eastern Colorado VA Healthcare System, University of Colorado

Last full review/revision Jul 2020| Content last modified Jul 2020
Click here for the Professional Version

Lung tumors can be

All lung tumors require medical evaluation because even noncancerous tumors can cause problems if they grow and block breathing.

The treatment of lung tumors depends on whether they are cancerous or noncancerous.

Noncancerous lung tumors

Noncancerous lung tumors can be divided into those that occur in the

  • Trachea or bronchial tubes: Hamartomas (most common non-cancerous lung tumors), bronchial cystadenomas, which grow in the main or smaller bronchi, myoblastomas, and papillomas

  • Lung tissue: Fibromas, hamartomas, leiomyomas, lipomas, neurofibromas, schwannomas, and sclerosing hemangiomas

Non-cancerous tumors may be identified based on the types of cells that make up the tumor (such as smooth muscle, fat, or nerve cells). Hamartomas are unique in that they are composed of disorganized bits of mature tissues such as cartilage, fat, and muscle.

Some non-cancerous masses in the lungs are caused not by a new growth of lung cells (neoplasm) but rather by inflammation due to an infection or to an immune disease, such as sarcoidosis.

Non-cancerous tumors often cause no symptoms other than wheezing, coughing, or shortness of breath, particularly if they press on or block an airway or become large.

Most often, doctors unexpectedly diagnose a noncancerous lung tumor when a chest x-ray or other imaging test is done for another purpose.

Most non-cancerous tumors are not treated, but some may need to be removed surgically to prevent the airway from becoming blocked.

NOTE: This is the Consumer Version. DOCTORS: Click here for the Professional Version
Click here for the Professional Version
Others also read

Test your knowledge

Asbestosis is widespread scarring of lung tissue caused by breathing asbestos dust. Which of the following is responsible for the largest number of lung cancer cases among people with asbestosis? 
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID

Also of Interest

Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID
Download the Manuals App iOS ANDROID