In 1967, Dr. A. Margulis opened a new era in diagnostic radiology introducing the concepts of interventional radiology as a new subspeciality of diagnostic radiology, we prefer to call this active radiology, though. Examples of therapeutic, active radiological procedures carried out by radiologists, at the department of radiology, Seoul National University Hospital, are presented. They comprise a case of extraction of residual common bile duct stone through the T-tube, a case of common bile duct recannalization through the T-tube in common bile duct cancer patient, cases of intraarterial epinephrine infusion in massive gatrointestinal bleeding, a case of Gelfoam embolization of hepatic artery in bleeding hepatoma, percutaneous translumbar pyelography and nephrostomy in patients of obstructive renal diseases, a cases of percutaneous transhepatic cholangiography and drainage in inoperable obstructive javndice patient, two cases of atrioseptostomy with the Rashkind baloon cathete in patients of complete transposition of great vessels, and 215 cases of reduction of colonic intussusception with barium enema.