A tumor biopsy is a medical procedure used to remove a sample of tissue from a tumor for examination. This helps doctors determine whether the tumor is benign (non-cancerous) or malignant (cancerous). The biopsy can be performed using various methods, including needle aspiration, endoscopy, or surgical removal. After the tissue sample is collected, it is sent to a laboratory where a pathologist examines it under a microscope. The results provide crucial information about the tumor's type, grade, and potential treatment options, guiding the patient's care plan and management of their condition.