A Lesion...What Does The Doctor Mean?
Pronounced "lee-sion" with the emphasis on the "lee," a lesion can be almost any abnormal change involving any tissue or organ due to disease or injury. There are numerous types of lesions with different naming classifications.
Lesions can be categorized according to whether or not they are caused by cancer. A benign lesion is non-cancerous whereas a malignant lesion is cancerous. For example, a biopsy of a skin lesion may prove it to be benign or malignant, or evolving into a malignant lesion (called a premalignant lesion).
Lesions can be defined according to the patterns they form. For example, a bull's-eye or target lesion is one that looks like the bull's eye on a target. (In an X-ray of the duodenum, a bull's-eye lesion can represent a tumor with an ulcer (crater) in the center.) A coin lesion is a round shadow resembling a coin on a chest X-ray. It, too, is usually due to a tumor.
Lesions can be named for persons who first described them. For instance, a Ghon lesion (or Ghon focus) is the scar-like "signature" in the lungs of adults left by tuberculosis in childhood.
Lesions can also be categorized by their size. A gross lesion is
one that can be seen with the naked eye. A microscopic or histologic
lesion requires the magnification of a microscope to be seen. The
basis of sickle cell disease is a molecular lesion, one that is not
even visible with a microscope but is only detectable on the
molecular (protein or DNA) level.