What is a focal lesion?

A focal lesion is a localized area of damage or abnormality within a particular part of the body. Focal lesions can occur anywhere in the body, but are commonly associated with the brain, liver, lungs, or bones. These lesions can be benign or malignant, depending on the underlying cause. Benign focal lesions may be a result of trauma, infection or inflammation, while malignant focal lesions are usually associated with cancer. Focal lesions are typically identified through diagnostic imaging techniques, such as MRI, CT scan, PET scan, or ultrasound. Treatment for focal lesions depends on the underlying cause and may include surgery, radiation, chemotherapy, or a combination of therapies.