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A lesion is a general term used to describe any abnormal change in the structure or function of a tissue or organ. Lesions can be caused by various factors, including infections, injuries, or diseases. They can appear as raised, flat, or depressed areas and may be visible on the skin or internal organs. Lesions can be benign, meaning they are not cancerous, or malignant, indicating cancer.

A tumor, on the other hand, is a specific type of lesion characterized by the uncontrolled growth of abnormal cells. Tumors can be benign or malignant. Benign tumors, also known as non-cancerous tumors, grow slowly and do not spread to other parts of the body. Malignant tumors, or cancers, grow rapidly and can invade nearby tissues and spread to distant organs through the bloodstream or lymphatic system.

Lesions and tumors can be detected through various diagnostic methods, including imaging tests such as X-rays, CT scans, MRI, and ultrasound. Biopsies, which involve removing a small sample of tissue for examination, may also be performed to confirm the presence of a lesion or tumor and determine its nature.

Treatment for lesions and tumors depends on their type, size, location, and whether they are benign or malignant. Options may include observation, surgery, radiation therapy, chemotherapy, or targeted therapy. Early detection and appropriate treatment are crucial for improving outcomes and managing the impact of lesions and tumors on a person's health.