There are certain tumors which are not cancerous and are called as benign tumors . Many of these tumors however do cause significant discomfort to the patient and they may involve different organs such that their complete removal by surgery becomes dangerous . These tumors are also not generally responsive to chemotherapy or radiotherapy as they are not composed of rapidly dividing cancerous cells . Interventional Radiologists provide effective treatments for these lesions using various techniques such as embolization , lasers , sclerotherapy or ablations .