Are there different types of benign lung tumors?

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Are there different types of benign lung tumors?

Yes, there are several types of benign lung tumors. Tumors that are generally larger than three centimeters (1.2 inches) are called masses. If your tumor is three centimeters or less in diameter, it’s commonly called a nodule. If the nodule forms in your lungs, it’s called a pulmonary nodule.

Types of benign lung tumors and nodules include:

Hamartomas

Hamartomas are the most common type of benign lung nodule. They account for about 55% of all benign lung tumors, and 8% of all lung tumors. About 80% are found in the outer portion of the lung's connective tissue. The rest are found inside the bronchial tubes (the airways leading to the lungs).

Hamartomas are made up of "normal" tissues such as cartilage, connective tissue, fat, and muscle but in abnormal amounts. They are usually less than four centimeters in diameter and appear in chest X-rays as a coin-like round growth. In about 15% of cases they may look like fluffy wool or popcorn. Hamartomas usually stay within a limited area and are not likely to press against nearby tissue. They are found more often in males than females, and between the ages of 50 and 70.

Bronchial adenomas

Adenomas are another common type of benign lung nodule. They grow in the large airways of the lungs (bronchi) and in the mucus glans or ducts of the windpipe.

Papillomas

Papillomas are a less common type of benign lung tumor. They grow in the bronchial tubes, sticking out from the surface area where they attached. Papillomas are divided into three types.

  • Squamous: One or more squamous papillomas can occur in both children and adults. They result from infection by the human papilloma virus (HPV), the same virus that causes warts and certain sexually transmitted diseases.
  • Glandular: These papillomas are less common than squamous papillomas and develop in larger airways compared with squamous papillomas. They occur in all ages but mostly adults. They almost always appear as one nodule, centrally located. No cause has been identified.
  • Mixed squamous and glandular: These papillomas contain a mix of squamous and glandular papilloma tissue. Only a small number of cases have been reported. These papillomas have the potential to eventually turn cancerous because the squamous cells can change over time.

Other benign lung tumors

Other rare tumors include chondromas, fibromas, neurofibromas and lipomas. These tumors are made up of connective tissue or fatty tissue.

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